Question

C# openfiledialog 点取消 提示 空路径名是非法的 错误

我用try catch 把 这个错误屏蔽了 。。请问还有什么办法能够使他不提示非法？
private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
{
try
{
System.Windows.Forms.OpenFileDialog txt = new System.Windows.Forms.OpenFileDialog();
txt.Title = "打开";
txt.ShowDialog();
String txtname = txt.FileName;
StreamReader s = new StreamReader(txtname,System.Text .Encoding.Default );
String txtcontent;
txtcontent = s.ReadToEnd();
textBox1.Text = txtcontent;

}
catch( Exception ex)
{ }
}

Answer 1

if (txt.ShowDialog()==DialogResult.OK)
{
String txtname = txt.FileName;
StreamReader s = new StreamReader(txtname,System.Text .Encoding.Default );
String txtcontent;
txtcontent = s.ReadToEnd();
textBox1.Text = txtcontent;
}