Question

如果有任何验证错误（使用CellValidating事件使用单元格的ErrorText属性设置），我希望阻止用户保存对DataGridView所做的更改。

我正在寻找（但看不到）myDataGridView.HasErrors()等方法？

Answer 1

在msdn中有一个关于如何验证DataGridView的示例看看......

我希望它有所帮助

Answer 2

在验证行的同时执行此操作。使用MSDN示例arik发布了......

private void dataGridView1_CellValidating(object sender,
    DataGridViewCellValidatingEventArgs e)
{
    dataGridView1.Rows[e.RowIndex].ErrorText = "";
    int newInteger;

    if (dataGridView1.Rows[e.RowIndex].IsNewRow) { return; }
    if (!int.TryParse(e.FormattedValue.ToString(),
        out newInteger) || newInteger < 0)
    {
        e.Cancel = true;
        dataGridView1.Rows[e.RowIndex].ErrorText = "the value must be a non-negative integer";

        //If it's simple, do something like this here.
        this.SubmitButton.Enabled = false;

        //If not, set a private boolean variable scoped to your class that you can use elsewhere.
        this.PassedValidation = false;
    }
}

Answer 3

我认为这个问题现在已经解决了，但我会添加我的解决方案来帮助其他人在处理多字段验证方面遇到同样的问题：

我创建了一些pubilc变量来存储输入是否有效：

public bool validation1_valid = true;
public bool validation2_valid = true;

然后，在DataGrid的_CellValueChanged方法中：

private void gridView_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        string cellHeader = gridView.Columns[e.ColumnIndex].HeaderText.ToString();

       //if cell is one that needs validating
       if (cellHeader == "Something" || cellHeader == "Something Else")
       {
           //if it isn't null/empty
           if (gridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value != null
               && gridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString() != "")
           {
               //check if it's valid (here using REGEX to check if it's a number)                  
               if (System.Text.RegularExpressions.Regex.IsMatch(gridView.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString(), @"^(?:^\d+$|)$"))
               {
                   //set the relevant boolean if the value to true if the cell it passes validation
                   switch (cellHeader)
                   {
                       case "Something":
                           validation1_valid= true;
                           break;
                       case "Something Else":
                           validation2_valid= true;
                           break;
                   }

                   //Add an error text
                   gridView.Columns[e.ColumnIndex].DefaultCellStyle.ForeColor = Color.Black;
                   gridView.Rows[e.RowIndex].Cells[e.ColumnIndex].ErrorText = String.Empty;
                   gridView.Rows[e.RowIndex].ErrorText = String.Empty;

                   //DON'T disable the button here - it will get changed every time the validation is called
               }
               else //doesn't pass validation
               {
                   //set boolean to false
                   switch (cellHeader)
                   {
                       case "Something":
                           validation1_valid = false;
                           break;
                       case "Something Else":
                           validation2_valid = false;
                           break;
                   }

                   gridView.Columns[e.ColumnIndex].DefaultCellStyle.ForeColor = Color.Red;
                   gridView.Rows[e.RowIndex].Cells[e.ColumnIndex].ErrorText = "Value must be numeric.";
                }
           }
           else //null or empty - I'm allowing these, so set error to "" and booleans to true
           {
               switch (cellHeader)
                   {
                       case "Something":
                           validation1_valid = true;
                           break;
                       case "Something Else":
                           validation2_valid = true;
                           break;
                   }
               gridView.Columns[e.ColumnIndex].DefaultCellStyle.ForeColor = Color.Black;
               gridView.Rows[e.RowIndex].Cells[e.ColumnIndex].ErrorText = String.Empty;
               gridView.Rows[e.RowIndex].ErrorText = String.Empty;
           }
       }

       //if there is an invalid field somewhere
       if (validation1_valid == false || validation2_valid == false)
       {
           //set the button to false, and add an error to the row
           btnSave.Enabled = false;
           gridView.Rows[e.RowIndex].ErrorText = "There are validation errors.";
       }
       //else if they're all vaild
       else if (validation1_valid == true && validation2_valid == true)
       {
           //set the button to true, and remove the error from the row
           btnSave.Enabled = true;
           gridView.Rows[e.RowIndex].ErrorText = String.Empty;
       }
    }

DataGridView HasErrors？

3 个答案: