C# 向datatable添加列并添加数据
如何向datatable添加列,并根据条件向每行添加数据。 这就是我想做的C# 向datatable添加列并添加数据,c#,sql-server,datatable,dataset,C#,Sql Server,Datatable,Dataset,如何向datatable添加列,并根据条件向每行添加数据。 这就是我想做的 conn = new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0; Data Source =" + Server.MapPath("App_Data\\LR Product Database 2000.mdb")); conn.Open(); Dictionary&
conn = new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0;
Data Source =" + Server.MapPath("App_Data\\LR Product Database 2000.mdb"));
conn.Open();
Dictionary<string, string> items = new Dictionary<string, string>();
OleDbCommand cmd = conn.CreateCommand();
cmd.CommandText = "SELECT CODE, TITLE FROM tblProducts";
OleDbDataReader dbread = cmd.ExecuteReader();
while (dbread.Read())
{
productCode = (string)dbread["ProductCode"];
productTitle = items[productCode];
items.Add(productCode, productTitle);
}
sqlCon = new SqlConnection(ConfigurationManager.ConnectionStrings["LRVWebsite"].ToString());
sqlCon.Open();
dsSql = new DataSet();
SqlDataAdapter dba = new SqlDataAdapter(@"SELECT C.CustomerFirstName,C.CustomerLastName, C.CustomerCompany,C.CustomerPosition,C.CustomerCountry,C.CustomerProvince,C.CustomerContact,CP.ActionDate,CP.ProductCode,CP.CustomerEmail FROM tblCustomers C INNER JOIN tblCustomerProducts CP ON C.CustomerEmail = CP.CustomerEmail ORDER BY ActionDate DESC", connString);
dba.Fill(dsSql,"Products");
DataTable dt = dsSql.Tables["Products"];
foreach (DataRow dr in dt.Rows)
{
for (int i = 0; i < items.Count; i++)
{
if (dr["ProductCode"].ToString().Equals(productCode))
{
//here I want to add a new column and add data (productTitle) to the column
}
}
}
conn=new-OleDbConnection(@“Provider=Microsoft.Jet.OleDb.4.0;
数据源=“+Server.MapPath”(“App_Data\\LR产品数据库2000.mdb”);
conn.Open();
字典项=新字典();
OleDbCommand cmd=conn.CreateCommand();
cmd.CommandText=“从tblProducts中选择代码、标题”;
OleDbDataReader dbread=cmd.ExecuteReader();
while(dbread.Read())
{
productCode=(字符串)dbread[“productCode”];
productTitle=项目[productCode];
添加(产品代码、产品标题);
}
sqlCon=新的SqlConnection(ConfigurationManager.ConnectionString[“LRVWebsite”].ToString());
sqlCon.Open();
dsSql=新数据集();
SqlDataAdapter dba=new SqlDataAdapter(@“选择C.CustomerFirstName、C.CustomerLastName、C.CustomerCompany、C.CustomerPosition、C.CustomerCountry、C.CustomerProvince、C.CustomerContact、CP.ActionDate、CP.ProductCode、CP.CustomerMail FROM tblCustomers内部连接tblCustomerProducts CP ON C.CustomerMail=CP.CustomerMail按ActionDate描述订购”,字符串);
dba.Fill(dsSql,“产品”);
DataTable dt=dsSql.Tables[“产品”];
foreach(数据行dr在dt.行中)
{
对于(int i=0;i
此外,我将扩展代码以避免NullReferenceException
if (!String.IsNullOrEmpty(dr["ProductCode"]) && dr["ProductCode"].ToString().Equals(productCode))
{
dr["ColumnName"] = value;
}
此外,我将扩展代码以避免NullReferenceException
if (!String.IsNullOrEmpty(dr["ProductCode"]) && dr["ProductCode"].ToString().Equals(productCode))
{
dr["ColumnName"] = value;
}