从openFileDialog浏览窗口中仅选择.txt文件时如何启用按钮 [英] How to enable button when select only .txt file from openFileDialog browse window

问题描述

解决方案

试试这个

 private void btnBrowse_Click（ object sender，RoutedEventArgs e）
 {
 Microsoft.Win32.OpenFileDialog openFileDialog = new Microsoft.Win32.OpenFileDialog（）; 
 openFileDialog.DefaultExt =" .txt" ;; 
 openFileDialog.Filter ="文本文件（* .txt）| * .txt |所有文件（*。*）| *。*" ;; 
 openFileDialog.InitialDirectory = Environment.GetFolderPath（Environment.SpecialFolder.MyDocuments）; 
 result = openFileDialog.Filter; 
 if（openFileDialog.ShowDialog（）== true）//打开文件对话框窗口
 {
 txtpath = openFileDialog.FileName; 
 FileNameTextBox.Text = txtpath; 
 string ext = System.IO.Path.GetExtension（txtpath）; 
 
 if（ext.ToUpper（）==" .TXT"）
 {
 btnCompaire.IsEnabled = true; 
} 
 
 
} 
} 

Hi,

解决方案

try this

private void btnBrowse_Click(object sender, RoutedEventArgs e)
{
Microsoft.Win32.OpenFileDialog openFileDialog = new Microsoft.Win32.OpenFileDialog();
openFileDialog.DefaultExt = ".txt";
openFileDialog.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"; 
openFileDialog.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
result = openFileDialog.Filter;
if (openFileDialog.ShowDialog() == true) //Open file dialog window
{
txtpath = openFileDialog.FileName; 
FileNameTextBox.Text = txtpath;
string ext =  System.IO.Path.GetExtension(txtpath);

if (ext.ToUpper() == ".TXT")
             { 
btnCompaire.IsEnabled = true;
             }


}
} 

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