檢查Gridview中的重複項並顯示錯誤消息（如果存在）？

我有一個上傳功能，它會將csv文件上傳到gridview。我想檢查Gridview的第一列是否有重複的記錄記錄。如果有，我想顯示一條錯誤消息，如「重複記錄！」並使一個名爲btnimport1的按鈕不可見。誰能幫我？這是我的代碼至今：檢查Gridview中的重複項並顯示錯誤消息（如果存在）？

//A method to display errors in the gridview 
    private string ErrorMessage(string input) 

     { 
      { 
       //if there are null values, error message will be displayed. 
       if (!string.IsNullOrEmpty(input)) 
        return input; 
       //making the button invisble, so that the user will be forced to cancel import and re-upload new file 
       BtnImport1.Visible = false; 
      } 
      return "No value entered!"; 

     } 

    protected void btnUpload_Click(object sender, EventArgs e) 
    { 

     //get the uploaded file name 
     string strFileNameOnServer = fileUpload.PostedFile.FileName; 
     //get the uploaded file's extension 
     string fileExt = 
     System.IO.Path.GetExtension(fileUpload.FileName); 



     // if the uploaded file is not null and the file extension is csv, do the try 
     if (fileUpload.PostedFile != null && fileExt == ".csv") 
     { 

      try 
      { 


       fileUpload.PostedFile.SaveAs(Server.MapPath("~/Uploads")); 

       //to display the contents of file 
       Label1.Text = "File name: " + 
         fileUpload.PostedFile.FileName + "<br>" + 
         fileUpload.PostedFile.ContentLength + " kb<br>" + 
         "Content type: " + 
         fileUpload.PostedFile.ContentType; 
      } 
      catch (Exception ex) 
      { 
       Label1.Text = "Error saving <b>" + strFileNameOnServer + "</b><br>. " + ex.Message; 
      } 

      //to make the import and cancel import button visible so that users can either choose to import or cancel 
      BtnImport1.Visible = true; 
      Cancel.Visible = true; 

      //to make the upload button invisible 
      fileUpload.Visible = false; 
      btnUpload.Visible = false; 

     } 
     else 
     { 
      //if the user does not select anything or the file is extension is not .csv, the error message will be displayed 
      Label1.Text = "Error - a file name must be specified/only csv files are allowed"; 
      return; 

     } 

     // to read all lines of the posted csv file and put the lines in the grid view 
     var data = File.ReadAllLines(Server.MapPath("~/Uploads")) 
      // to split the lines according to commas 
      .Select(line => line.Split(',')) 
      .Select(columns => new { GuestID =ErrorMessage(columns.Length<=8?"":columns[0]), IC_No = ErrorMessage(columns[1]), Grouping = ErrorMessage(columns[2]), Remarks = ErrorMessage(columns[3]), GuestName = ErrorMessage(columns[4]), Class_Group = ErrorMessage(columns[5]), Staff = ErrorMessage(columns[6]), Attendance_Parents_Only = ErrorMessage(columns[7]), Registration = ErrorMessage(columns.Length<=8?"":columns[8]) }); 



     myGridView.DataSource = data; 
     myGridView.DataBind(); 
     }

我只想在第一列，這是列0感謝重複檢查並顯示錯誤信息！

來源

2011-09-06 Mark20

我認爲這將是更好的爲您管理您的數據插入和更改，以便首先不會出現重複記錄 - 而不是在事實之後顯示錯誤。 –

上傳實際上允許用戶上傳，因此，我不能限制他們，這就是爲什麼我需要錯誤檢查 – Mark20

private bool CheckDuplicates(string stringtobeChecked) 
{ 
    foreach (GridViewRow row in GridView_FtpStatus.Rows) 
    { 
     if ((row.Cells[0].Text) == stringtobeChecked) 
      return true; 
     else 
      return false; 
    } 
    return false; 
}

基於上述結果進行最終actions.Hope它有助於

來源

2012-02-20 11:36:43

這裏是爲最好的例子，

For index As Integer = 0 To GridView1.Rows.Count - 1 
      If GridView1.Rows(index).Cells(0).Text = "value" Then 
       ScriptManager.RegisterClientScriptBlock(Me, GetType(Page), "", "<script>alert('duplicate records');</script>", False) 
      End If 
     Next

來源

2013-10-24 05:16:10

檢查Gridview中的重複項並顯示錯誤消息（如果存在）？

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