在 DataGridView 中单击 EditLink 单元格和 DeleteLink 单元格时，winform 中出现 System.IndexOutOfRangeException 错误答案

【问题标题】：System.IndexOutOfRangeException error in winform when EditLink cell and DeleteLink cell is clicked upon in DataGridView在 DataGridView 中单击 EditLink 单元格和 DeleteLink 单元格时，winform 中出现 System.IndexOutOfRangeException 错误
【发布时间】：2023-03-29 14:06:01
【问题描述】：

我有一个名为 dataGridView1 的 DataGridView，我在其中创建了 9 个列用于获取员工的详细信息，并为 EditLinkCellColumn 和 DeleteLinkCellColumn 创建了 2 个附加列，用于执行编辑和删除操作。下面的方法是在datagridview中第一次添加记录。

private void AddFirstRecord()
    {
        dtEmployee = new DataTable();
        dtEmployee.Columns.Add("First Name");
        dtEmployee.Columns.Add("Last Name");
        dtEmployee.Columns.Add("City");
        dtEmployee.Columns.Add("Date of birth");
        dtEmployee.Columns.Add("Email");
        dtEmployee.Columns.Add("Gender");
        dtEmployee.Columns.Add("Contact");
        dtEmployee.Columns.Add("Income");
        dtEmployee.Columns.Add("Experience");
        DataRow drEmployee = dtEmployee.NewRow();
        drEmployee[0] = txtFirstName.Text;
        drEmployee[1] = txtLastName.Text;
        drEmployee[2] = txtCity.Text;
        drEmployee[3] = mtxtDateofBirth.Text;
        drEmployee[4] = txtEmail.Text;
        if (rdbMale.Checked)
            drEmployee[5] = rdbMale.Text;
        else
            drEmployee[5] = rdbFemale.Text;
        drEmployee[6] = mtxtContact.Text;
        drEmployee[7] = txtIncome.Text;
        drEmployee[8] = cmbExperience.Text;
        dtEmployee.Rows.Add(drEmployee);
        dataGridView1.DataSource = dtEmployee;

        dataGridView1.AutoGenerateColumns = false;
        DataGridViewLinkColumn EditLink = new DataGridViewLinkColumn();
        EditLink.UseColumnTextForLinkValue = true;
        EditLink.HeaderText = "Edit";
        EditLink.LinkBehavior = LinkBehavior.SystemDefault;
        EditLink.Text = "edit";
        dataGridView1.Columns.Add(EditLink);
        DataGridViewLinkColumn DeleteLink = new DataGridViewLinkColumn();
        DeleteLink.UseColumnTextForLinkValue = true;
        DeleteLink.HeaderText = "Delete";
        DeleteLink.LinkBehavior = LinkBehavior.SystemDefault;
        DeleteLink.Text = "delete";
        dataGridView1.Columns.Add(DeleteLink);
        dataGridView1.DataSource = dtEmployee;
    }//AddFirstRecord

AddNewRecord() 方法用于在添加第一条记录后添加记录。

  private void AddNewRecord()
    {
        DataRow drEmployee = dtEmployee.NewRow();
        drEmployee[0] = txtFirstName.Text;
        drEmployee[1] = txtLastName.Text;
        drEmployee[2] = txtCity.Text;
        drEmployee[3] = mtxtDateofBirth.Text;
        drEmployee[4] = txtEmail.Text;
        if (rdbFemale.Checked)
            drEmployee[5] = rdbFemale.Text;
        else
            drEmployee[5] = rdbMale.Text;
        drEmployee[6] = mtxtContact.Text;
        drEmployee[7] = txtIncome.Text;
        drEmployee[8] = cmbExperience.Text;
        dtEmployee.Rows.Add(drEmployee);
        dataGridView1.DataSource = dtEmployee;
    }

我已经编写了下面显示的方法来触发编辑和删除链接单元格，但它在 if (dtEmployee.Columns[columnIndex].ColumnName == "Edit") 行显示错误 IndexOutOfRangeException 说它找不到第 9 列并且在 else if (dtEmployee.Columns[e.ColumnIndex].ColumnName == "Delete") 说它找不到第 10 列。

 private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        try
        {
            int columnIndex = e.ColumnIndex;
            int rowIndex = dataGridView1.CurrentCell.RowIndex;

            if (dtEmployee.Columns[columnIndex].ColumnName == "Edit")
            {
                dataGridView1.BeginEdit(true);
                dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);
            }
            else if (dtEmployee.Columns[e.ColumnIndex].ColumnName == "Delete")
            {
                if (MessageBox.Show("Are you sure you want to delete?", "Deleting...", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                    dtEmployee.Rows.RemoveAt(rowIndex);
            }
        }
        catch(Exception ex)
        {
            MessageBox.Show("Sorry for the inconvenience" + ex.ToString() );
        }
    }

【问题讨论】：

标签： c# .net winforms datagridview indexoutofrangeexception

【解决方案1】：

try
    {
        int columnIndex = e.ColumnIndex;
        int rowIndex = dataGridView1.CurrentCell.RowIndex;

        if (dataGridView1.Columns[columnIndex].HeaderText == "Edit")
        {
            dataGridView1.BeginEdit(true);
            dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);
        }
        else if (dataGridView1.Columns[e.ColumnIndex].HeaderText == "Delete")
        {
            if (MessageBox.Show("Are you sure you want to delete?", "Deleting...", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                dtEmployee.Rows.RemoveAt(rowIndex);
        }
    }
    catch(Exception ex)
    {
        MessageBox.Show("Sorry for the inconvenience" + ex.ToString() );
    }

【讨论】：

【解决方案2】：

尝试用这个替换您的 CellContentClick 事件处理程序。

  private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
    {
        try
        {
            int columnIndex = e.ColumnIndex;
            int rowIndex = e.RowIndex;
            string columnValue = dtEmployee.Rows[rowIndex].Cells[columnIndex].HeaderText.ToString();

            if (columnValue == "Edit")
            {
                dataGridView1.BeginEdit(true);
                dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);
            }
            else if (columnValue == "Delete")
            {
                if (MessageBox.Show("Are you sure you want to delete?", "Deleting...", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                    dtEmployee.Rows.RemoveAt(rowIndex);
            }
        }
        catch(Exception ex)
        {
            MessageBox.Show("Sorry for the inconvenience" + ex.ToString() );
        }
    }

【讨论】：