有DataTable中

Question

沒有排在位置0誤差下面的代碼，我得到錯誤的

有一個在位置0

protected void btnUpload_Click(object sender, EventArgs e) 
{ 

    DataTable dtExcel = new DataTable(); 
    dtExcel.Clear(); 

    if (Convert.ToInt32(dtExcel.Rows[0]["Mkey"]) > 0) // here is the error 
    { 
     Hid_Mode.Value = "M"; 
     hid_mkey.Value = dtExcel.Rows[0]["Mkey"].ToString(); 
    } 
    else 
    { 
     Hid_Mode.Value = "A"; 
     hid_mkey.Value = "0"; 
    } 

Answer 1

更改你的代碼像這樣沒有行：

DataTable dtExcel = new DataTable(); 
dtExcel.Clear(); 

if (dtExcel.Rows.Count > 0) //Here's the change 
{ 
    Hid_Mode.Value = "M"; 
    hid_mkey.Value = dtExcel.Rows[0]["Mkey"].ToString(); 
} 
else 
{ 
    Hid_Mode.Value = "A"; 
    hid_mkey.Value = "0"; 
}