C# 将DataTable中的日期列导入sql server之前，将其转换为所需格式

我正在将excel工作表导入sql server db表，该表由 id |数据，实际日期为mm/dd/yyyy 我可以将数据导入数据库表，但我希望excel工作表的datadate列在导入sql server之前转换为yyyy/mm/dd格式。以下是我导入excel工作表的代码：

      DataTable dt7 = new DataTable();
      dt7.Load(dr);

                // Bulk Copy to SQL Server
     using (SqlBulkCopy bulkCopy = new SqlBulkCopy(sqlConnectionString))
     {                       


     bulkCopy.DestinationTableName = "ExcelTable";


     bulkCopy.WriteToServer(dt7);


     }
     dr.Close();

我找到了一段将mm/dd/yyyy转换为yyyy/mm/dd的代码：

    string a = "12/20/2012";
    DateTime dt = Convert.ToDateTime(a);
    string st = dt.ToString("yyyy/MM/dd");
    Label1.Text = a;
    Label2.Text = st;

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但是我不知道如何在我的代码中实现它。我是一个完全的新手，所以您可能需要用代码解释：

您必须从DataTable中检索所有数据行。选择日期列，修改它，然后将其放回

DataRow[]  ExcelRows;
ExcelDataTable.Rows.CopyTo(ExcelRows,0);

For(int i=0;i<ExcelRows.Length;i++)//i represents the row
{
     var oldDate=ExcelRows [i]["DateColumn"].ToString();
     var newDate=Convert.ToDateTime(oldDate);   
     ExcelRows [i]["DateColumn"] = newDate.ToString("yyyy/MM/dd");   
}  

 bulkCopy.WriteToServer(ExcelRows);

试试这个：

Imports System.Data
Imports System.Data.OleDb
Imports System.Data.SqlClient
Imports System.Web.Configuration

//Declare Variables - Edit these based on your particular situation
Dim sSQLTable As String = "TempTableForExcelImport"
Dim sExcelFileName As String = "myExcelFile.xls"
Dim sWorkbook As String = "[WorkbookName$]"

//Create our connection strings
Dim sExcelConnectionString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath(sExcelFileName) & ";Extended Properties=""Excel 8.0;HDR=YES;"""
Dim sSqlConnectionString As String = WebConfigurationManager.ConnectionStrings("MyConnectionString").ToString


//Series of commands to bulk copy data from the excel file into our SQL table
Dim OleDbConn As OleDbConnection = New OleDbConnection(sExcelConnectionString)
Dim OleDbCmd As OleDbCommand = New OleDbCommand(("SELECT * FROM " & sWorkbook), OleDbConn)
OleDbConn.Open()
Dim dr As OleDbDataReader = OleDbCmd.ExecuteReader()


Using bulkCopy As New System.Data.SqlClient.SqlBulkCopy(con) 
bulkCopy.DestinationTableName = "tblExcel" 

//Define ColumnMappings: source(Excel) --destination(DB Table column)   
bulkCopy.ColumnMappings.Add("col1", "col1") 
bulkCopy.ColumnMappings.Add("col2", "col2") 
:
:
bulkCopy.ColumnMappings.Add("col2", ExcelRows [i]["DateColumn"].ToString("yyyy/MM/dd")) //This is for date

bulkCopy.WriteToServer(dr) 

End Using 
bulkCopy.WriteToServer(dr)
OleDbConn.Close()

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ExcelDataTable在我的例子中代表dt7，对吗？我用dt7替换了它，但它的所有red不能隐式地将类型'System.Data.DataRowCollection转换为System.Data.Datarows[]错误，DataRow[]ExcelRows=new DataRow；CS0122:“System.Data.DataRow.DataRowSystem.Data.DataRowBuilder”由于其保护级别而不可访问。我的excel工作表如下所示：id | datawhich is date您错误地声明数组匹配：DataRow[]ExcelRows=新DataRow[ExcelDataTable.Rows.Count]；