C# 将CSV转换为数据表
我有一个返回csv行的方法。但是我想把它转换成一个数据表。也就是说,只要是“,”我就想把数据放到一个新的列单元格中C# 将CSV转换为数据表,c#,asp.net,csv,export,C#,Asp.net,Csv,Export,我有一个返回csv行的方法。但是我想把它转换成一个数据表。也就是说,只要是“,”我就想把数据放到一个新的列单元格中 private static string ConvertGridViewRowToCsvRow(GridViewRow row) { StringBuilder csvRow = new StringBuilder(); bool firstCell = true; foreach (DataControlFieldCell ce
private static string ConvertGridViewRowToCsvRow(GridViewRow row)
{
StringBuilder csvRow = new StringBuilder();
bool firstCell = true;
foreach (DataControlFieldCell cell in row.Cells)
{
string text = string.Empty;
if (!String.IsNullOrEmpty(cell.Text))
{
text = cell.Text;
}
else if (cell.Controls.Count > 0)
{
foreach (var control in cell.Controls)
{
if (control is ITextControl)
{
var textControl = control as ITextControl;
text += HttpUtility.HtmlDecode(textControl.Text).Replace("\r", string.Empty).Replace("\n", string.Empty).Trim();
}
else if (control is TextImage)
{
var textImage = control as TextImage;
text += HttpUtility.HtmlDecode(textImage.Text).Replace("\r", string.Empty).Replace("\n", string.Empty).Trim();
}
}
}
if (!firstCell)
{
csvRow.Append(",");
}
csvRow.Append(MakeTextCsvFriendly(text));
firstCell = false;
}
return csvRow.ToString();
}
这是在调用ConvertGridViewRowTocsRow
public static void Export(string fileName, GridView gv, HashSet<string> selectedRows)
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader(
"content-disposition", string.Format("attachment; filename={0}", fileName));
HttpContext.Current.Response.ContentType = "text/csv";
//SetHiddenColumnsVisibility(gv); enable if you want only selected columns to visible on export (not current business requirement)
var csvFile = new StringBuilder();
using (StringWriter sw = new StringWriter())
{
using (HtmlTextWriter htw = new HtmlTextWriter(sw))
{
if (gv.HeaderRow != null)
{
GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
bool firstCell = true;
foreach (DataControlFieldHeaderCell cell in gv.HeaderRow.Cells)
{
if (!firstCell)
{
csvFile.Append(",");
}
string text = cell.ContainingField.HeaderText;
csvFile.Append(MakeTextCsvFriendly(text));
firstCell = false;
}
csvFile.Append("\r\n");
}
if (selectedRows.Count > 0)
{
foreach (GridViewRow row in gv.Rows)
{
if (row.RowType == DataControlRowType.DataRow && selectedRows.Contains(gv.DataKeys[row.RowIndex].Value.ToString()))
{
GridViewExportUtil.PrepareControlForExport(row);
csvFile.AppendLine(ConvertGridViewRowToCsvRow(row));
}
}
}
else
{
foreach (GridViewRow row in gv.Rows)
{
GridViewExportUtil.PrepareControlForExport(row);
csvFile.AppendLine(ConvertGridViewRowToCsvRow(row));
}
}
// render the htmlwriter into the response
HttpContext.Current.Response.Write(csvFile.ToString());
HttpContext.Current.Response.End();
}
}
}
publicstaticvoid导出(字符串文件名、GridView gv、HashSet selectedRows)
{
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.AddHeader(
“内容处置”,string.Format(“附件;文件名={0}”,文件名));
HttpContext.Current.Response.ContentType=“text/csv”;
//SetHiddenColumnsVisibility(gv);如果希望导出时仅显示选定列(而不是当前业务需求),则启用
var csvFile=新的StringBuilder();
使用(StringWriter sw=new StringWriter())
{
使用(HtmlTextWriter htw=新的HtmlTextWriter(sw))
{
如果(gv.HeaderRow!=null)
{
GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
bool firstCell=true;
foreach(gv.HeaderRow.Cells中的DataControlFieldHeaderCell单元)
{
if(!firstCell)
{
csvFile.Append(“,”);
}
字符串文本=cell.ContainingField.HeaderText;
Append(MakeTextCsvFriendly(text));
firstCell=false;
}
csvFile.Append(“\r\n”);
}
如果(selectedRows.Count>0)
{
foreach(gv.Rows中的GridViewRow行)
{
如果(row.RowType==DataControlRowType.DataRow&&selectedRows.Contains(gv.DataKeys[row.RowIndex].Value.ToString())
{
GridViewExportUtil.PrepareControlForExport(行);
AppendLine(convertGridViewRowTocsRow(行));
}
}
}
其他的
{
foreach(gv.Rows中的GridViewRow行)
{
GridViewExportUtil.PrepareControlForExport(行);
AppendLine(convertGridViewRowTocsRow(行));
}
}
//将htmlwriter呈现到响应中
HttpContext.Current.Response.Write(csvFile.ToString());
HttpContext.Current.Response.End();
}
}
}
我正在考虑一种方法,它将取代csvFile.Append(“,”)
或可能使用此类文件将数据存储在数据表中的文件
然而,我需要指导来构建这个方法
我尝试使用下面的代码将csv文件转换为windows应用程序的datatable
如果工作正常,请不要忘记将其标记为答案。您的代码没有编译或对我不起作用。在包括“使用Microsoft.VisualBasic.FileIO;”并将“filePath”更改为“filePath”之后,我仍然得到一个System.ArgumentException:输入数组的长度超过了此表中的列数。
private void CSVtoDataTable(string filepath)
{
int count = 1;
char fieldSeparator = ',';
DataTable csvData = new DataTable();
using (TextFieldParser csvReader = new TextFieldParser(filePath))
{
csvReader.HasFieldsEnclosedInQuotes = true;
while (!csvReader.EndOfData)
{
csvReader.SetDelimiters(new string[] { "," });
string[] fieldData = csvReader.ReadFields();
if(count==0)
{
foreach (string column in fieldData)
{
DataColumn datecolumn = new DataColumn(column);
datecolumn.AllowDBNull = true;
csvData.Columns.Add(datecolumn);
}
}
else
{
csvData.Rows.Add(fieldData);
}
}
}
}