c# - 将 excel 中的数据表列填充为字符串

Question

我正在从格式化(小数、日期等)的 Excel 工作表中填充数据表。

我的问题是列被格式化为 Excel 工作表，但我需要将所有列填充为字符串，我该怎么做？

我的导入方式:

Private Function upload(filename As String) As DataTable
        Dim FilePath__1 As String = "Uploads/"
        Try
            Dim allowdFile As String() = {".xls", ".xlsx"}
            Dim FileExt As String = ".xls"

            Dim isValidFile As Boolean = allowdFile.Contains(FileExt)
            If Not isValidFile Then
                Return Nothing
            Else
                Dim filePath__2 As String = Server.MapPath(FilePath__1) & filename

                Dim con As OleDbConnection = Nothing
                If FileExt = ".xls" Then
                    con = New OleDbConnection((Convert.ToString("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=") & filePath__2) + ";Extended Properties=Excel 8.0;")
                ElseIf FileExt = ".xlsx" Then
                    con = New OleDbConnection((Convert.ToString("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=") & filePath__2) + ";Extended Properties=Excel 12.0;")
                End If
                con.Open()

                Dim dt As DataTable = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, Nothing)

                Dim getExcelSheetName As String = dt.Rows(0)("Table_Name").ToString()

                Dim ExcelCommand As New OleDbCommand((Convert.ToString("SELECT * FROM [") & getExcelSheetName) + "]", con)
                Dim ExcelAdapter As New OleDbDataAdapter(ExcelCommand)
                Dim ExcelDataSet As New DataSet()
                ExcelAdapter.Fill(ExcelDataSet)
                con.Close()
                If ExcelDataSet.Tables.Count > 0 Then
                    Return ExcelDataSet.Tables(0)
                Else
                    Return Nothing
                End If
            End If
        Catch ex As Exception
            Return Nothing
        End Try
    End Function

任何帮助都会很好。

Answer 1

一个简单的方法是循环行并使用ToString:

DataTable tblOld = ExcelDataSet.Tables[0];
DataTable tblNew = new DataTable();
foreach (DataColumn col in tblOld.Columns)
    tblNew.Columns.Add(col.ColumnName);
foreach (DataRow rowOld in tblOld.Rows)
{
    DataRow rowNew = tblNew.Rows.Add();
    foreach (DataColumn col in tblOld.Columns)
    {
        rowNew.SetField(col.ColumnName, rowOld.IsNull(col) ? "" : rowOld[col].ToString());
    }
} 
return tblNew;