谷歌搜索出现了很多例子使用方法：



1. openFileDialog ： microsoft docs openFileDialog wpf示例 - Google搜索 [ ^ ]：

* WPF教程 - OpenFileDialog [ ^ ]

* OpenFileDialog示例 [ ^ ]

* 如何：使用OpenFileDialog组件打开文件| Microsoft Docs [ ^ ]



2.读取文本文件： wpf读取文本文件 - Google搜索 [ ^ ]

* 如何：读取文本f rom a File | Microsoft Docs [ ^ ]

* 如何在C＃中读取文本文件？ [ ^ ]

* 使用C＃读取和写入文本文件押韵 [ ^ ]



来自如何：使用OpenFileDialog组件打开文件Microsoft Docs [ ^ ]：

Google search turns up lots of examples of how to use:

1. openFileDialog: microsoft docs openFileDialog wpf example - Google Search[^]:
* WPF Tutorial - The OpenFileDialog[^]
* OpenFileDialog sample[^]
* How to: Open Files Using the OpenFileDialog Component | Microsoft Docs[^]

2. Read a text file: wpf read a text file - Google Search[^]
* How to: Read Text from a File | Microsoft Docs[^]
* How to read a text file in C#?[^]
* Reading and writing to a text file with C# | Rhyous[^]

A concise solution from How to: Open Files Using the OpenFileDialog Component | Microsoft Docs[^]:

private void openFileClick(object sender, RoutedEventArgs e)
{  
   if(openFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)  
   {  
      System.IO.StreamReader sr = new   
         System.IO.StreamReader(openFileDialog1.FileName);  
      source.Text = sr.ReadToEnd();
      sr.Close();  
   }  
}

此外，除了 wpf-tutorial .com [ ^ ]另一个有用的网站是：你应该知道的关于WPF的2000件事WPF开发人员需要知道的所有内容，在Bite-Sized Chunks中 [ ^ ]

Also, besides wpf-tutorial.com[^] another good helpful site is: 2,000 Things You Should Know About WPF | Everything a WPF Developer Needs to Know, in Bite-Sized Chunks[^]

您已创建 openFileDialogFileOk 方法，但尚未将其连接到 openFileDialog.FileOk 事件：

You've created the openFileDialogFileOk method, but you haven't wired it up to the openFileDialog.FileOk event:

public MainWindow()
{
    InitializeComponent();
    openFileDialog = new OpenFileDialog();
    openFileDialog.FileOk += openFileDialogFileOk; // <-- Add this line
}

你还应该避免在循环中使用字符串连接，因为效率非常低：

You should also avoid using string concatenation in a loop, as it's extremely inefficient:

private void openFileDialogFileOk(object sender, System.ComponentModel.CancelEventArgs e)
{
    string fullPathname = openFileDialog.FileName;
    FileInfo src = new FileInfo(fullPathname);
    fileName.Text = src.FullName;
    
    source.Text = File.ReadAllText(src.FullName);
}

File.ReadAllText方法 [ ^ ]