C# 另一个是使用StringBuilder类 public static string DataTableToJsonObj(DataTable dt) { DataSet ds = new DataSet(); ds.Merge(dt); StringBuilder jsonString = new StringBuilder(); if (ds.Tables[0].Rows.Count > 0) { jsonString.Append("["); for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++) { jsonString.Append("{"); for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++) { jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":"); /* //IF NOT LAST PROPERTY if (cols < ds.Tables[0].Columns.Count - 1) { GenerateJsonProperty(ds, rows, cols, jsonString); } //IF LAST PROPERTY else if (cols == ds.Tables[0].Columns.Count - 1) { GenerateJsonProperty(ds, rows, cols, jsonString, true); } */ var b = (cols < ds.Tables[0].Columns.Count - 1) ? GenerateJsonProperty(ds, rows, cols, jsonString) : (cols != ds.Tables[0].Columns.Count - 1) || GenerateJsonProperty(ds, rows, cols, jsonString, true); } jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},"); } jsonString.Append("]"); return jsonString.ToString(); } return null; } private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false) { // IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA' string addComma = isLast ? "" : ","; if (ds.Tables[0].Rows[rows][cols] == DBNull.Value) { jsonString.Append(" null " + addComma); } else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime)) { jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma); } else if (ds.Tables[0].Columns[cols].DataType == typeof(string)) { jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma); } else if (ds.Tables[0].Columns[cols].DataType == typeof(bool)) { jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle"); } else { jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma); } return true; }
使用Newtonsoft Json.NETC# 另一个是使用StringBuilder类 public static string DataTableToJsonObj(DataTable dt) { DataSet ds = new DataSet(); ds.Merge(dt); StringBuilder jsonString = new StringBuilder(); if (ds.Tables[0].Rows.Count > 0) { jsonString.Append("["); for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++) { jsonString.Append("{"); for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++) { jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":"); /* //IF NOT LAST PROPERTY if (cols < ds.Tables[0].Columns.Count - 1) { GenerateJsonProperty(ds, rows, cols, jsonString); } //IF LAST PROPERTY else if (cols == ds.Tables[0].Columns.Count - 1) { GenerateJsonProperty(ds, rows, cols, jsonString, true); } */ var b = (cols < ds.Tables[0].Columns.Count - 1) ? GenerateJsonProperty(ds, rows, cols, jsonString) : (cols != ds.Tables[0].Columns.Count - 1) || GenerateJsonProperty(ds, rows, cols, jsonString, true); } jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},"); } jsonString.Append("]"); return jsonString.ToString(); } return null; } private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false) { // IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA' string addComma = isLast ? "" : ","; if (ds.Tables[0].Rows[rows][cols] == DBNull.Value) { jsonString.Append(" null " + addComma); } else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime)) { jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma); } else if (ds.Tables[0].Columns[cols].DataType == typeof(string)) { jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma); } else if (ds.Tables[0].Columns[cols].DataType == typeof(bool)) { jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle"); } else { jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma); } return true; },c#,json,datatable,C#,Json,Datatable,使用Newtonsoft Json.NET string JSONresult; JSONresult = JsonConvert.SerializeObject(dt); Response.Write(JSONresult); public static string DataTableToJsonObj(DataTable dt) { DataSet ds = new DataSet(); ds.Merge(dt); St
string JSONresult;
JSONresult = JsonConvert.SerializeObject(dt);
Response.Write(JSONresult);
public static string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder jsonString = new StringBuilder();
if (ds.Tables[0].Rows.Count > 0)
{
jsonString.Append("[");
for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++)
{
jsonString.Append("{");
for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++)
{
jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":");
/*
//IF NOT LAST PROPERTY
if (cols < ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString);
}
//IF LAST PROPERTY
else if (cols == ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
*/
var b = (cols < ds.Tables[0].Columns.Count - 1)
? GenerateJsonProperty(ds, rows, cols, jsonString)
: (cols != ds.Tables[0].Columns.Count - 1)
|| GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},");
}
jsonString.Append("]");
return jsonString.ToString();
}
return null;
}
private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false)
{
// IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA'
string addComma = isLast ? "" : ",";
if (ds.Tables[0].Rows[rows][cols] == DBNull.Value)
{
jsonString.Append(" null " + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime))
{
jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(string))
{
jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(bool))
{
jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle");
}
else
{
jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma);
}
return true;
}
参考链接:
public static string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder jsonString = new StringBuilder();
if (ds.Tables[0].Rows.Count > 0)
{
jsonString.Append("[");
for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++)
{
jsonString.Append("{");
for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++)
{
jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":");
/*
//IF NOT LAST PROPERTY
if (cols < ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString);
}
//IF LAST PROPERTY
else if (cols == ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
*/
var b = (cols < ds.Tables[0].Columns.Count - 1)
? GenerateJsonProperty(ds, rows, cols, jsonString)
: (cols != ds.Tables[0].Columns.Count - 1)
|| GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},");
}
jsonString.Append("]");
return jsonString.ToString();
}
return null;
}
private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false)
{
// IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA'
string addComma = isLast ? "" : ",";
if (ds.Tables[0].Rows[rows][cols] == DBNull.Value)
{
jsonString.Append(" null " + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime))
{
jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(string))
{
jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(bool))
{
jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle");
}
else
{
jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma);
}
return true;
}
使用StringBuilder
public string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder JsonString = new StringBuilder();
if (ds != null && ds.Tables[0].Rows.Count > 0)
{
JsonString.Append("[");
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
JsonString.Append("{");
for (int j = 0; j < ds.Tables[0].Columns.Count; j++)
{
if (j < ds.Tables[0].Columns.Count - 1)
{
JsonString.Append("\"" + ds.Tables[0].Columns[j].ColumnName.ToString() + "\":" + "\"" + ds.Tables[0].Rows[i][j].ToString() + "\",");
}
else if (j == ds.Tables[0].Columns.Count - 1)
{
JsonString.Append("\"" + ds.Tables[0].Columns[j].ColumnName.ToString() + "\":" + "\"" + ds.Tables[0].Rows[i][j].ToString() + "\"");
}
}
if (i == ds.Tables[0].Rows.Count - 1)
{
JsonString.Append("}");
}
else
{
JsonString.Append("},");
}
}
JsonString.Append("]");
return JsonString.ToString();
}
else
{
return null;
}
}
public static string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder jsonString = new StringBuilder();
if (ds.Tables[0].Rows.Count > 0)
{
jsonString.Append("[");
for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++)
{
jsonString.Append("{");
for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++)
{
jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":");
/*
//IF NOT LAST PROPERTY
if (cols < ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString);
}
//IF LAST PROPERTY
else if (cols == ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
*/
var b = (cols < ds.Tables[0].Columns.Count - 1)
? GenerateJsonProperty(ds, rows, cols, jsonString)
: (cols != ds.Tables[0].Columns.Count - 1)
|| GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},");
}
jsonString.Append("]");
return jsonString.ToString();
}
return null;
}
private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false)
{
// IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA'
string addComma = isLast ? "" : ",";
if (ds.Tables[0].Rows[rows][cols] == DBNull.Value)
{
jsonString.Append(" null " + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime))
{
jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(string))
{
jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(bool))
{
jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle");
}
else
{
jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma);
}
return true;
}
公共字符串DataTableToJsonObj(DataTable dt)
{
数据集ds=新数据集();
ds.合并(dt);
StringBuilder JsonString=新的StringBuilder();
如果(ds!=null&&ds.Tables[0].Rows.Count>0)
{
JsonString.Append(“[”);
对于(int i=0;i
使用C#.net将datatable转换为JSON
public static string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder jsonString = new StringBuilder();
if (ds.Tables[0].Rows.Count > 0)
{
jsonString.Append("[");
for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++)
{
jsonString.Append("{");
for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++)
{
jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":");
/*
//IF NOT LAST PROPERTY
if (cols < ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString);
}
//IF LAST PROPERTY
else if (cols == ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
*/
var b = (cols < ds.Tables[0].Columns.Count - 1)
? GenerateJsonProperty(ds, rows, cols, jsonString)
: (cols != ds.Tables[0].Columns.Count - 1)
|| GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},");
}
jsonString.Append("]");
return jsonString.ToString();
}
return null;
}
private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false)
{
// IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA'
string addComma = isLast ? "" : ",";
if (ds.Tables[0].Rows[rows][cols] == DBNull.Value)
{
jsonString.Append(" null " + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime))
{
jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(string))
{
jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(bool))
{
jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle");
}
else
{
jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma);
}
return true;
}
公共静态对象DataTableToJSON(DataTable)
{
var list=新列表();
foreach(table.Rows中的DataRow行)
{
var dict=新字典();
foreach(table.Columns中的数据列col)
{
dict[coll.ColumnName]=(Convert.ToString(row[col]);
}
列表。添加(dict);
}
JavaScriptSerializer serializer=新的JavaScriptSerializer();
返回序列化程序。序列化(列表);
}
这与公认答案的方法类似,但使用LINQ将datatable转换为一行代码中的列表
//convert datatable to list using LINQ. Input datatable is "dt", returning list of "name:value" tuples
var lst = dt.AsEnumerable()
.Select(r => r.Table.Columns.Cast<DataColumn>()
.Select(c => new KeyValuePair<string, object>(c.ColumnName, r[c.Ordinal])
).ToDictionary(z=>z.Key,z=>z.Value)
).ToList();
//now serialize it
var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
return serializer.Serialize(lst);
public static string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder jsonString = new StringBuilder();
if (ds.Tables[0].Rows.Count > 0)
{
jsonString.Append("[");
for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++)
{
jsonString.Append("{");
for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++)
{
jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":");
/*
//IF NOT LAST PROPERTY
if (cols < ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString);
}
//IF LAST PROPERTY
else if (cols == ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
*/
var b = (cols < ds.Tables[0].Columns.Count - 1)
? GenerateJsonProperty(ds, rows, cols, jsonString)
: (cols != ds.Tables[0].Columns.Count - 1)
|| GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},");
}
jsonString.Append("]");
return jsonString.ToString();
}
return null;
}
private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false)
{
// IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA'
string addComma = isLast ? "" : ",";
if (ds.Tables[0].Rows[rows][cols] == DBNull.Value)
{
jsonString.Append(" null " + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime))
{
jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(string))
{
jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(bool))
{
jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle");
}
else
{
jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma);
}
return true;
}
//使用LINQ将数据表转换为列表。输入数据表为“dt”,返回“name:value”元组列表
var lst=dt.AsEnumerable()
.Select(r=>r.Table.Columns.Cast()
.Select(c=>newkeyvaluepair(c.ColumnName,r[c.Ordinal])
).ToDictionary(z=>z.Key,z=>z.Value)
).ToList();
//现在将其序列化
var serializer=new System.Web.Script.Serialization.JavaScriptSerializer();
返回序列化程序。序列化(lst);
这是一种非常有用的枚举数据表的方法,通常需要大量的编码!以下是一些变体:
//convert to list with array of values for each row
var list1 = dt.AsEnumerable().Select(r => r.ItemArray.ToList()).ToList();
//convert to list of first column values only
var list2 = dt.AsEnumerable().Select(r => r.ItemArray[0]).ToList();
// parse a datatable with conditions and get CSV string
string MalesOver21 = string.Join(",",
dt.AsEnumerable()
.Where(r => r["GENDER"].ToString()=="M" && r.Field<int>("AGE")>21)
.Select(r => r.Field<string>("FULLNAME"))
);
public static string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder jsonString = new StringBuilder();
if (ds.Tables[0].Rows.Count > 0)
{
jsonString.Append("[");
for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++)
{
jsonString.Append("{");
for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++)
{
jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":");
/*
//IF NOT LAST PROPERTY
if (cols < ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString);
}
//IF LAST PROPERTY
else if (cols == ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
*/
var b = (cols < ds.Tables[0].Columns.Count - 1)
? GenerateJsonProperty(ds, rows, cols, jsonString)
: (cols != ds.Tables[0].Columns.Count - 1)
|| GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},");
}
jsonString.Append("]");
return jsonString.ToString();
}
return null;
}
private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false)
{
// IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA'
string addComma = isLast ? "" : ",";
if (ds.Tables[0].Rows[rows][cols] == DBNull.Value)
{
jsonString.Append(" null " + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime))
{
jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(string))
{
jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(bool))
{
jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle");
}
else
{
jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma);
}
return true;
}
//转换为包含每行值数组的列表
var list1=dt.AsEnumerable().Select(r=>r.ItemArray.ToList()).ToList();
//仅转换为第一列值列表
var list2=dt.AsEnumerable().Select(r=>r.ItemArray[0]).ToList();
//使用条件解析数据表并获取CSV字符串
string MalesOver21=string.Join(“,”,
dt.AsEnumerable()
其中(r=>r[“性别”].ToString()==“M”和&r.Field(“年龄”)>21)
.Select(r=>r.Field(“全名”))
);
这与原始问题无关,但为了完整性起见,我要提到,如果您只想从现有数据表中筛选出行,请尝试此自定义函数
public static string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder jsonString = new StringBuilder();
if (ds.Tables[0].Rows.Count > 0)
{
jsonString.Append("[");
for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++)
{
jsonString.Append("{");
for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++)
{
jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":");
/*
//IF NOT LAST PROPERTY
if (cols < ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString);
}
//IF LAST PROPERTY
else if (cols == ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
*/
var b = (cols < ds.Tables[0].Columns.Count - 1)
? GenerateJsonProperty(ds, rows, cols, jsonString)
: (cols != ds.Tables[0].Columns.Count - 1)
|| GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},");
}
jsonString.Append("]");
return jsonString.ToString();
}
return null;
}
private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false)
{
// IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA'
string addComma = isLast ? "" : ",";
if (ds.Tables[0].Rows[rows][cols] == DBNull.Value)
{
jsonString.Append(" null " + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime))
{
jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(string))
{
jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(bool))
{
jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle");
}
else
{
jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma);
}
return true;
}
公共静态字符串DataTableToJsonObj(DataTable dt)
{
数据集ds=新数据集();
ds.合并(dt);
StringBuilder jsonString=新的StringBuilder();
如果(ds.Tables[0].Rows.Count>0)
{
jsonString.Append(“[”);
对于(int rows=0;rows public static string DataTableToJsonObj(DataTable dt)
{
DataSet ds = new DataSet();
ds.Merge(dt);
StringBuilder jsonString = new StringBuilder();
if (ds.Tables[0].Rows.Count > 0)
{
jsonString.Append("[");
for (int rows = 0; rows < ds.Tables[0].Rows.Count; rows++)
{
jsonString.Append("{");
for (int cols = 0; cols < ds.Tables[0].Columns.Count; cols++)
{
jsonString.Append(@"""" + ds.Tables[0].Columns[cols].ColumnName + @""":");
/*
//IF NOT LAST PROPERTY
if (cols < ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString);
}
//IF LAST PROPERTY
else if (cols == ds.Tables[0].Columns.Count - 1)
{
GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
*/
var b = (cols < ds.Tables[0].Columns.Count - 1)
? GenerateJsonProperty(ds, rows, cols, jsonString)
: (cols != ds.Tables[0].Columns.Count - 1)
|| GenerateJsonProperty(ds, rows, cols, jsonString, true);
}
jsonString.Append(rows == ds.Tables[0].Rows.Count - 1 ? "}" : "},");
}
jsonString.Append("]");
return jsonString.ToString();
}
return null;
}
private static bool GenerateJsonProperty(DataSet ds, int rows, int cols, StringBuilder jsonString, bool isLast = false)
{
// IF LAST PROPERTY THEN REMOVE 'COMMA' IF NOT LAST PROPERTY THEN ADD 'COMMA'
string addComma = isLast ? "" : ",";
if (ds.Tables[0].Rows[rows][cols] == DBNull.Value)
{
jsonString.Append(" null " + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(DateTime))
{
jsonString.Append(@"""" + (((DateTime)ds.Tables[0].Rows[rows][cols]).ToString("yyyy-MM-dd HH':'mm':'ss")) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(string))
{
jsonString.Append(@"""" + (ds.Tables[0].Rows[rows][cols]) + @"""" + addComma);
}
else if (ds.Tables[0].Columns[cols].DataType == typeof(bool))
{
jsonString.Append(Convert.ToBoolean(ds.Tables[0].Rows[rows][cols]) ? "true" : "fasle");
}
else
{
jsonString.Append(ds.Tables[0].Rows[rows][cols] + addComma);
}
return true;
}
public static string ConvertIntoJson(DataTable dt)
{
var jsonString = new StringBuilder();
if (dt.Rows.Count > 0)
{
jsonString.Append("[");
for (int i = 0; i < dt.Rows.Count; i++)
{
jsonString.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
jsonString.Append("\"" + dt.Columns[j].ColumnName + "\":\""
+ dt.Rows[i][j].ToString().Replace('"','\"') + (j < dt.Columns.Count - 1 ? "\"," : "\""));
jsonString.Append(i < dt.Rows.Count - 1 ? "}," : "}");
}
return jsonString.Append("]").ToString();
}
else
{
return "[]";
}
}
public static string ConvertIntoJson(DataSet ds)
{
var jsonString = new StringBuilder();
jsonString.Append("{");
for (int i = 0; i < ds.Tables.Count; i++)
{
jsonString.Append("\"" + ds.Tables[i].TableName + "\":");
jsonString.Append(ConvertIntoJson(ds.Tables[i]));
if (i < ds.Tables.Count - 1)
jsonString.Append(",");
}
jsonString.Append("}");
return jsonString.ToString();
}
//Common DLL client, server
public class transferDataTable
{
public class myError
{
public string Message { get; set; }
public int Code { get; set; }
}
public myError Error { get; set; }
public List<string> ColumnNames { get; set; }
public List<string> DataTypes { get; set; }
public List<Object> Data { get; set; }
public int Count { get; set; }
}
public static class ExtensionMethod
{
public static transferDataTable LoadData(this transferDataTable transfer, DataTable dt)
{
if (dt != null)
{
transfer.DataTypes = new List<string>();
transfer.ColumnNames = new List<string>();
foreach (DataColumn c in dt.Columns)
{
transfer.ColumnNames.Add(c.ColumnName);
transfer.DataTypes.Add(c.DataType.ToString());
}
transfer.Data = new List<object>();
foreach (DataRow dr in dt.Rows)
{
foreach (DataColumn col in dt.Columns)
{
transfer.Data.Add(dr[col] == DBNull.Value ? null : dr[col]);
}
}
transfer.Count = dt.Rows.Count;
}
return transfer;
}
public static DataTable GetDataTable(this transferDataTable transfer, bool ConvertToLocalTime = true)
{
if (transfer.Error != null || transfer.ColumnNames == null || transfer.DataTypes == null || transfer.Data == null)
return null;
int columnsCount = transfer.ColumnNames.Count;
DataTable dt = new DataTable();
for (int i = 0; i < columnsCount; i++ )
{
Type colType = Type.GetType(transfer.DataTypes[i]);
dt.Columns.Add(new DataColumn(transfer.ColumnNames[i], colType));
}
int index = 0;
DataRow row = dt.NewRow();
foreach (object o in transfer.Data)
{
if (ConvertToLocalTime && o != null && o.GetType() == typeof(DateTime))
{
DateTime dat = Convert.ToDateTime(o);
row[index] = dat.ToLocalTime();
}
else
row[index] = o == null ? DBNull.Value : o;
index++;
if (columnsCount == index)
{
index = 0;
dt.Rows.Add(row);
row = dt.NewRow();
}
}
return dt;
}
}
//Server
[OperationContract]
[WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.WrappedRequest, UriTemplate = "json/data")]
transferDataTable _Data();
public transferDataTable _Data()
{
try
{
using (SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["myConnString"]))
{
con.Open();
DataSet ds = new DataSet();
SqlDataAdapter myAdapter = new SqlDataAdapter("SELECT * FROM tbGalleries", con);
myAdapter.Fill(ds, "table");
DataTable dt = ds.Tables["table"];
return new transferDataTable().LoadData(dt);
}
}
catch(Exception ex)
{
return new transferDataTable() { Error = new transferDataTable.myError() { Message = ex.Message, Code = ex.HResult } };
}
}
//Client
Response = Vossa.getAPI(serviceUrl + "json/data");
transferDataTable transfer = new JavaScriptSerializer().Deserialize<transferDataTable>(Response);
if (transfer.Error == null)
{
DataTable dt = transfer.GetDataTable();
dbGrid.ItemsSource = dt.DefaultView;
}
else
MessageBox.Show(transfer.Error.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
private string DataTableToJson(DataTable dt) {
if (dt == null) {
return "[]";
};
if (dt.Rows.Count < 1) {
return "[]";
};
JArray array = new JArray();
foreach(DataRow dr in dt.Rows) {
JObject item = new JObject();
foreach(DataColumn col in dt.Columns) {
item.Add(col.ColumnName, dr[col.ColumnName]?.ToString());
}
array.Add(item);
}
return array.ToString(Newtonsoft.Json.Formatting.Indented);
}
public DataTable GetTable()
{
string str = "Select * from GL_V";
OracleCommand cmd = new OracleCommand(str, con);
cmd.CommandType = CommandType.Text;
DataTable Dt = OracleHelper.GetDataSet(con, cmd).Tables[0];
return Dt;
}
public string DataTableToJSONWithJSONNet(DataTable table)
{
string JSONString = string.Empty;
JSONString = JsonConvert.SerializeObject(table);
return JSONString;
}
public static DataSet GetDataSet(OracleConnection con, OracleCommand cmd)
{
// create the data set
DataSet ds = new DataSet();
try
{
//checking current connection state is open
if (con.State != ConnectionState.Open)
con.Open();
// create a data adapter to use with the data set
OracleDataAdapter da = new OracleDataAdapter(cmd);
// fill the data set
da.Fill(ds);
}
catch (Exception ex)
{
throw;
}
return ds;
}
StringBuilder sb = new StringBuilder();
string connectionstring = @"Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=Northwind;Integrated Security=True";
using (var conn = new SqlConnection(connectionstring))
{
conn.Open();
var comm = new SqlCommand("SELECT * FROM Customers", conn);
SqlDataAdapter adap = new SqlDataAdapter(comm);
DataTable dt = new DataTable("Customer");
adap.Fill(dt);
using (var parser = new ChoJSONWriter(sb))
parser.Write(dt);
}
Console.WriteLine(sb.ToString());
{
"Customer": [
{
"CustomerID": "ALFKI",
"CompanyName": "Alfreds Futterkiste",
"ContactName": "Maria Anders",
"ContactTitle": "Sales Representative",
"Address": "Obere Str. 57",
"City": "Berlin",
"Region": null,
"PostalCode": "12209",
"Country": "Germany",
"Phone": "030-0074321",
"Fax": "030-0076545"
},
{
"CustomerID": "ANATR",
"CompanyName": "Ana Trujillo Emparedados y helados",
"ContactName": "Ana Trujillo",
"ContactTitle": "Owner",
"Address": "Avda. de la Constitución 2222",
"City": "México D.F.",
"Region": null,
"PostalCode": "05021",
"Country": "Mexico",
"Phone": "(5) 555-4729",
"Fax": "(5) 555-3745"
}
]
}
public static string ToJson(this DataTable dt)
{
List<Dictionary<string, object>> lst = new List<Dictionary<string, object>>();
Dictionary<string, object> item;
foreach (DataRow row in dt.Rows)
{
item = new Dictionary<string, object>();
foreach (DataColumn col in dt.Columns)
{
item.Add(col.ColumnName, (Convert.IsDBNull(row[col]) ? null : row[col]));
}
lst.Add(item);
}
return Newtonsoft.Json.JsonConvert.SerializeObject(lst);
}
DataTable dt = new DataTable();
.
.
.
var json = dt.ToJson();
static public string DataTableToJSON(DataTable dataTable,bool readableformat=true)
{
string JSONString="[";
string JSONRow;
string colVal;
foreach(DataRow dataRow in dataTable.Rows)
{
if(JSONString!="[") { JSONString += ","; }
JSONRow = "";
if (readableformat) { JSONRow += "\r\n"; }
JSONRow += "{";
foreach (DataColumn col in dataTable.Columns)
{
colVal = dataRow[col].ToString();
colVal = colVal.Replace("\"", "\\\"");
colVal = colVal.Replace("'", "\\\'");
if(JSONRow!="{"&&JSONRow!="\r\n{") {
JSONRow += ",";
}
JSONRow += "\"" + col.ColumnName + "\":\"" + colVal + "\"";
}
JSONRow += "}";
JSONString += JSONRow;
}
JSONString += "\r\n]";
return JSONString;
}
[
{"Field":"id","Type":"int(5)","Null":"NO","Key":"PRI","Default":"","Extra":"auto_increment"},
{"Field":"ad","Type":"int(11) unsigned","Null":"NO","Key":"MUL","Default":"","Extra":""},
{"Field":"soyad","Type":"varchar(20)","Null":"YES","Key":"","Default":"","Extra":""},
{"Field":"ulke","Type":"varchar(20)","Null":"YES","Key":"","Default":"","Extra":""},
{"Field":"alan","Type":"varchar(20)","Null":"YES","Key":"","Default":"","Extra":""},
{"Field":"numara","Type":"varchar(20)","Null":"NO","Key":"","Default":"","Extra":""}
]
$X='[
{"Field":"id","Type":"int(5)","Null":"NO","Key":"PRI","Default":"","Extra":"auto_increment"},
{"Field":"ad","Type":"int(11) unsigned","Null":"NO","Key":"MUL","Default":"","Extra":""},
{"Field":"soyad","Type":"varchar(20)","Null":"YES","Key":"","Default":"","Extra":""},
{"Field":"ulke","Type":"varchar(20)","Null":"YES","Key":"","Default":"","Extra":""},
{"Field":"alan","Type":"varchar(20)","Null":"YES","Key":"","Default":"","Extra":""},
{"Field":"numara","Type":"varchar(20)","Null":"NO","Key":"","Default":"","Extra":""}
]';
$Y=json_decode($X,true);
echo $Y[0]["Field"];
var_dump($Y);
string json = JsonConvert.SerializeObject(YourDataTable, Formatting.Indented);
YourDataTable = (DataTable)JsonConvert.DeserializeObject(json, (typeof(DataTable)));
// Get our Column definitions and serialize them using an anoymous function.
var columns = dt.Columns.Cast<DataColumn>().Select(c => new { DataPropertyName = c.ColumnName, DataPropertyType = c.DataType.ToString()});
resp.ObjSchema = JsonConvert.SerializeObject(columns);
resp.Obj = JsonConvert.SerializeObject(dt);
[
{
"DataPropertyName": "RowId",
"DataPropertyType ": "System.Int32"
},
{
"DataPropertyName": "ItemName",
"DataPropertyType ": "System.String"
}
]
// If your environment does not support dynamic you'll need to create a class for with DataPropertyName and DataPropertyType.
JsonConvert.DeserializeObject<List<dynamic>>(response.ObjSchema).ForEach(prop =>
{
dt.Columns.Add(new DataColumn() { ColumnName = prop.DataPropertyName, DataType = Type.GetType(prop.DataPropertyType.ToString()) });
});
// Merge the results ignoring the JSON schema.
dt.Merge(JsonConvert.DeserializeObject<DataTable>(response.Obj), true, MissingSchemaAction.Ignore);