如何创建显示文本文件的应用程序 [英] How do I create a application that display a text file

问题描述

大家好，请帮我练习。我正在尝试在WPF中创建一个打开，读取和显示文本文件内容的应用程序，但它不想打开任何文本文件。我做错了什么？



以下是我一直在使用的代码：

Hi all please help me with my exercise. I'm trying to create a application in WPF that open, read and display the contents of a text file, but it don't want to open any text files. What am I doing wrong?

Here's the code that I've been using:

namespace WhileStatement
{
  
    public partial class MainWindow : Window
    {
        private OpenFileDialog openFileDialog = null;

        public MainWindow()
        {
            InitializeComponent();
            openFileDialog = new OpenFileDialog();
        }

        private void openFileClick(object sender, RoutedEventArgs e)
        {
            openFileDialog.ShowDialog();
        }

        private void openFileDialogFileOk(object sender, System.ComponentModel.CancelEventArgs e)
        {
            string fullPathname = openFileDialog.FileName;
            FileInfo src = new FileInfo(fullPathname);
            fileName.Text = src.FullName;
            TextReader reader = src.OpenText();
            displayData(reader);
        }

        private void displayData(TextReader reader)
        {
            source.Text = "";
            string line = reader.ReadLine();
            while (line != null);
            {
                source.Text += line + '\n';
                line = reader.ReadLine();
            }
            reader.Close();
        }
    }
}

我尝试了什么：



我试过google和MSDN Library。

What I have tried:

I've tried google and MSDN Library.

推荐答案

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：< a href =https://wpf.2000things.com/>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 [ ^ ]

这篇关于如何创建显示文本文件的应用程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！