所有行在網格視圖中都不可見

Question

我寫了一個方法，如

     private void AvoidDuplicate()
    {
        for (int i = 0; i < grdView.Rows.Count; i++)
        {
            TextBox txtoldvalue = grdView.Rows[i].FindControl("txtLicenseNumber") as TextBox;
            string oldvalue = txtoldvalue.Text.ToString();

            for (int j = 0; j < grdView.Rows.Count; j++)
            {
                TextBox txtnewvalue = grdView.Rows[j].FindControl("txtLicenseNumber") as TextBox;
                string newvalue = txtnewvalue.Text.ToString();
                if (oldvalue == newvalue)
                {
                    grdView.Rows[j].Visible = false;
                }
            }
        }
    }

該函數在頁面加載時調用。 問題是它使 gridview 中的所有行都不可見。 我只想檢查是否有具有相同值的文本框，只有一行應該變得不可見。 請幫忙

Answer 1

嘗試使用字典。 獲取所有唯一值，然后檢查您的字典是否包含該值，如果不使其不可見

private void AvoidDuplicate()
{
  Dictionary<string,string> checkdictionary=new Dictionary<string,string>();

    for (int i = 0; i < grdView.Rows.Count; i++)
    {
        TextBox txtnewvalue = grdView.Rows[i].FindControl("txtLicenseNumber") as TextBox;
            string newvalue = txtnewvalue.Text.ToString();
        if(!checkdictionary.ContainsKey(newvalue))
        {
             checkdictionary[newvalue]="something";
        }
        else
        {
          grdView.Rows[i].Visible = false;
        }

    }
}

Answer 2

嘗試這個

 private void AvoidDuplicate()
        {
            for (int i = 0; i < grdView.Rows.Count; i++)
            {
                TextBox txtoldvalue = grdView.Rows[i].FindControl("txtLicenseNumber") as TextBox;
                string oldvalue = txtoldvalue.Text.ToString();

                for (int j = 0; j < grdView.Rows.Count; j++)
                {
                   if( j == i)
                     continue;
TextBox txtnewvalue = grdView.Rows[j].FindControl("txtLicenseNumber") as TextBox;
                    string newvalue = txtnewvalue.Text.ToString();
                    if (oldvalue == newvalue)
                    {
                        grdView.Rows[j].Visible = false;
                    }
                }
            }
        }

更簡單的方法是，使用DataView

    //populate your datatable dt. List your columns in ToTable method that you want to include in uniqueness of row.

    dt = dt.DefaultView.ToTable(true, "LicenseNumber");
    GridView1.DataSource = dt;
    GridView1.DataBind();