c# - 如果还设置了 InitialDirectory，OpenFileDialog 是否可以自动选择具有 FileName 中设置的值的文件？

Question

这有点挑剔，但如果文件存在并且 FileName 和 InitialDirectory 设置正确，为什么不自动选择该文件？

我有一个 OpenFileDialog，其中 FileName 和 InitialDirectory 设置正确，文件存在于此文件夹中。为什么当我运行 ShowDialog() 方法时文件没有被选中？

没有文件被选中，但如果它被选中就更好了，这样我就不必向下滚动来选择与其相邻的下一个文件。

有什么建议吗？

Answer 1

也许它并不完美，但它以某种方式满足了期望。

我有一个 Button，它在点击事件时显示 OpenFileDialog。以及将 SendKeys 发送到 OpenFileDialog 的异步方法。

    private async void button1_Click(object sender, EventArgs e){
                string initialDir = "directory\\";
                string FileName = "filename.smthng";
                string combinedDir = initialDir + FileName;
                if (File.Exists(combinedDir)) // if there is a file with that name at that directory
                {
                    openFileDialog1.InitialDirectory = initialDir; // setting directory name
                    openFileDialog1.FileName = FileName; // filename
                    BeginInvoke((Action)(() => openFileDialog1.ShowDialog())); // we need to use BeginInvoke to continue to the following code.
                    await SendKey(FileName); // Sends Key to Dialog 
                }
                else // if there is not file with that name works here because no keys need to send.
                {
                    openFileDialog1.InitialDirectory = initialDir;
                    openFileDialog1.FileName = FileName;
                    openFileDialog1.ShowDialog();
                }
    
    }

    private async Task SendKey(string FileName){
            await Task.Delay(250); // Wait for the Dialog shown at the screen
            SendKeys.SendWait("+{TAB}"); // First Shift + Tab moves to Header of DataGridView of OpenFileDialog
            SendKeys.SendWait("+{TAB}"); // Second Shift + Tab moves to first item of list
            SendKeys.SendWait(FileName); // after sending filename will directly moves it to the file that we are looking for
    }

结果；

编辑1;

好的，对于 .Net 3.5 还有 TaskParalelLibrary 但使用 Thread 会容易得多。

 Thread t;
 private const string initialDir = "C:\\";
 private const string FileName = "test.txt";
 private void button1_Click(object sender, EventArgs e){
       string combinedDir = initialDir + FileName;
       if (File.Exists(combinedDir)) // if there is a file with that name at that directory
            {
                openFileDialog1.InitialDirectory = initialDir; // setting directory name
                openFileDialog1.FileName = FileName; // filename
                BeginInvoke((Action)(() => openFileDialog1.ShowDialog())); // we need to use BeginInvoke to continue to the following code.
                t = new Thread(new ThreadStart(SendKey)); // Sends Key to Dialog with an seperate Thread.
                t.Start(); // Thread starts.
            }
            else // if there is not file with that name works here because no keys need to send.
            {
                openFileDialog1.InitialDirectory = initialDir;
                openFileDialog1.FileName = FileName;
                openFileDialog1.ShowDialog();
            }
        }
      
        private void SendKey()
        {
            Thread.Sleep(100); // Wait for the Dialog shown at the screen
            SendKeys.SendWait("+{TAB}"); // First Shift + Tab moves to Header of DataGridView of OpenFileDialog
            SendKeys.SendWait("+{TAB}"); // Second Shift + Tab moves to first item of list
            SendKeys.SendWait(FileName); // after sending filename will directly moves it to the file that we are looking for
        }