搜索datagridview不工作

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我试图通过我的datagridview上的第2列（数据类型：数字）运行搜索，但是不断收到以下错误消息：

I am trying to run a search through column 2 (data type: number) on my datagridview but keep getting the following error message:

An unhandled exception of type 'System.NullReferenceException' occurred in SpeedyRent.exe Additional information: Object reference not set to an instance of an object.

如果（！string.Equals（row。单元格[1] .Value.ToString（），driverNo.Text，StringComparison.OrdinalIgnoreCase））

The error is being thrown at if (!string.Equals(row.Cells[1].Value.ToString(), driverNo.Text, StringComparison.OrdinalIgnoreCase))

我做错了什么？我已经包括我的代码：

What is it that I'm doing wrong? I've included my code below:

void driverSearch() { CurrencyManager manager = (CurrencyManager)BindingContext[dataGridView1.DataSource]; manager.SuspendBinding(); bool shouldNotFilter = string.IsNullOrEmpty(driverNo.Text); foreach (DataGridViewRow row in dataGridView1.Rows) { if (shouldNotFilter) { row.Visible = true; } else { if (!string.Equals(row.Cells[1].Value.ToString(), driverNo.Text, StringComparison.OrdinalIgnoreCase)) { row.Visible = false; } else { row.Visible = true; } } } manager.ResumeBinding(); } private void driverNo_KeyUp(object sender, KeyEventArgs e) { driverSearch(); } private void driverNo_TextChanged(object sender, EventArgs e) { driverSearch(); } private void driverNo_KeyPress(object sender, KeyPressEventArgs e) { if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar)) { e.Handled = true; } driverSearch(); }

推荐答案

在foreach循环中尝试此块：

try this block in foreach loop:

if (shouldNotFilter) { row.Visible = true; } else { if(row.Cells[1].Value == null) { row.Visible = false; } else { if (!string.Equals(row.Cells[1].Value.ToString(), driverNo.Text, StringComparison.OrdinalIgnoreCase)) { row.Visible = false; } else { row.Visible = true; } } }