DataGridView行错误索引超出范围c# [英] DataGridView Rows Error Index Out of Range c#

问题描述

我正在使用C#WinForms，其中有一些复选框，单击按钮时其文本将添加到datagridview(dgData)中.这是它的代码.

I am working on C# WinForms where i have some checkboxes, whose text are added in datagridview (dgData) on a button click. Here is its code.

private void btnAdd_Click(object sender, EventArgs e)
    {
        dgData.Rows.Clear();
        foreach(Control c in pnlDeficiency.Controls)
        {
            if ((c is CheckBox) && ((CheckBox)c).Checked)
            dgData.Rows.Add(c.Text);
        }
    }

我的保存代码在这里.

private void btnSave_Click(object sender, EventArgs e)
    {
        if (MessageBox.Show("Are You Sure You Want to Save the Record!", "TAC | Question", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == DialogResult.Yes)
        {
            SqlConnection S_Conn = new SqlConnection(strConnString);
            S_Conn.Open();
            int a = 10;
            for (int i = 0; i <= dgData.Rows.Count; i++)
            {
                string Query_Insert = "";
                Query_Insert = "INSERT into Deficiency_Details (Vendor_Id, Tender_Id, DeficiencyType) values ('" + cmbSelectVendor.SelectedValue + "', '" + cmbSelectTender.SelectedValue + "', '" + dgData.Rows[i].Cells[0].Value.ToString() + "')";
                SqlCommand Command_Insert = new SqlCommand(Query_Insert, S_Conn);
                a = Command_Insert.ExecuteNonQuery();
            }
            if (a == 0)
            {
                MessageBox.Show("Record Not Saved Successfully! Please Check Fields", "TAC | Alert", MessageBoxButtons.OKCancel, MessageBoxIcon.Error);
            }
            else
            {
                MessageBox.Show("Record Saved Successfully", "TAC | Success", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);
            }
            S_Conn.Close();
            S_Conn.Dispose();
            ResetAll();
        }
    }

我得到的错误是索引超出了范围.我已经调试了程序，错误在这一行

The error i get is Index out of rannge. I have debugged my program and the error is in this line

dgData.Rows[i].Cells[0].Value.ToString()

其中VALUE变为NULL的位置.我知道该错误，我之前已经解决了很多次，但这一次根本没有解决.请帮助我.

Where VALUE is going NULL. I know the error and i solved it many times before but this time its not solving at all. please help me.

推荐答案

问题是此行:

for (int i = 0; i <= dgData.Rows.Count; i++)

您需要将其更改为此:

for (int i = 0; i < dgData.Rows.Count; i++)

因为假设您的GridView中有10行.dgData.Rows.Count将为10.现在，由于< =运算符，您从0到10运行.0-10将是11次循环运行.您的GridView仅包含10行.因此，索引在您上一次循环迭代时超出范围.如果更改为<运算符，您的循环仅从0-9开始运行，这恰好是10次迭代.

Because let's say you got 10 Rows in your GridView. dgData.Rows.Count would be 10. Now you run from 0 to 10 because of your <= Operator. 0-10 would be 11 loop runnings. Your GridView only contains 10 rows. So the Index is out of range on your last loop iteration. If you change to < Operator your loop is just running from 0-9 which are exactly 10 iterations.

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