将数据从DataTable移动到Excel时出现exception
在下面的代码中，被评论的语句抛出一个exception
try { foreach(DataRow dr in dt.Rows) { for(int i=1; i<NumColumns+1; i++) { // this statement throws xlWorkSheet.Cells[rowCount, i].value=dr[i - 1].ToString(); } rowCount+=1; } } catch(Exception) { throw; } 它试图移动的数据如下：
=== 3 ===
以下是它的起始位置的截图：
这是可以解决的吗？ 还是我需要研究使用其他工具将数据移动到Excel中（如closedXML）？
这是因为string以等号开始 ，所以期望创build一个公式 。 你可以使用一个撇号然后等号（也就是以'=开头）。
您的原始string可能会导致与HRESULT:0x800A03EC COMException ，如下面的截图所示：
用我testing过的下面的代码，对数据没有问题，比如
'=== 3 ===
码：
namespace TestNamespace { using Excel=Microsoft.Office.Interop.Excel; public static class TestClass { static DataTable BuildTestDataTable() { var dt=new DataTable(); dt.Columns.Add("Name", typeof(String)); dt.Columns.Add("Age", typeof(int)); dt.Columns.Add("Gender", typeof(String)); dt.Columns.Add("Memo", typeof(String)); dt.Rows.Add(new object[] { "Leon Scott Kennedy", 36, "M", "'=== 1 ===" }); dt.Rows.Add(new object[] { "Ada Wong", 39, "F", "'=== 3 ===" }); return dt; } public static void ExportToExcel(this DataTable dt, String fileName) { var xlApp=new Excel.ApplicationClass(); var xlWorkBook=xlApp.Workbooks.Open( fileName, 0, false, // for read/write 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, 0, true, 1, 0 ); var xlWorkSheet=(Excel.Worksheet)xlWorkBook.Worksheets[1]; var NumColumns=dt.Columns.Count; var rowCount=dt.Rows.Count; try { foreach(DataRow dr in dt.Rows) { for(int i=1; i<NumColumns+1; i++) { xlWorkSheet.Cells[rowCount, i]=dr[i-1].ToString(); } rowCount+=1; } xlWorkBook.Save(); } catch(Exception) { throw; } finally { xlApp.Quit(); } } public static void TestMethod() { TestClass.BuildTestDataTable().ExportToExcel(@"c:\ExistingFile.xlsx"); // TestClass.BuildTestDataTable().ExportToExcel(@"c:\ExistingFile.xls"); } } }
尝试这个。
public void ExporttoExcel(DataTable table,string type) { HttpContext.Current.Response.Clear(); HttpContext.Current.Response.ClearContent(); HttpContext.Current.Response.ClearHeaders(); HttpContext.Current.Response.Buffer = true; HttpContext.Current.Response.ContentType = "application/ms-excel"; //HttpContext.Current.Response.ContentType = "application/ms-word"; HttpContext.Current.Response.Write(@"<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">"); HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename="+ type +".xls"); // HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=Reports.doc"); HttpContext.Current.Response.Charset = "utf-8"; HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1250"); HttpContext.Current.Response.Write("<font style='font-size:10.0pt; font-family:Calibri;'>"); HttpContext.Current.Response.Write("<BR><BR><BR>"); HttpContext.Current.Response.Write("<Table border='1' bgColor='#ffffff' borderColor='#000000' cellSpacing='2' cellPadding='2' style='font-size:10.0pt; font-family:Arial; background:white;'> <TR>"); int columnscount = table.Columns.Count; for (int j = 0; j < columnscount; j++) { HttpContext.Current.Response.Write("<Td>"); HttpContext.Current.Response.Write("<B>"); HttpContext.Current.Response.Write(table.Columns[j].ColumnName.ToString()); HttpContext.Current.Response.Write("</B>"); HttpContext.Current.Response.Write("</Td>"); } HttpContext.Current.Response.Write("</TR>"); foreach (DataRow row in table.Rows) { HttpContext.Current.Response.Write("<TR>"); for (int i = 0; i < table.Columns.Count; i++) { HttpContext.Current.Response.Write("<Td>"); HttpContext.Current.Response.Write(row[i].ToString()); HttpContext.Current.Response.Write("</Td>"); } HttpContext.Current.Response.Write("</TR>"); } HttpContext.Current.Response.Write("</Table>"); HttpContext.Current.Response.Write("</font>"); HttpContext.Current.Response.Flush(); HttpContext.Current.Response.End(); }