在 WPF 中单击按钮执行文件操作

Posted 2023-02-22

【中文标题】在 WPF 中单击按钮执行文件操作

【英文标题】：Perform File Operation On Button Click in WPF

【发布时间】：2012-10-13 18:51:05

【问题描述】：

我是一名 C++ 开发人员，最近转向 WPF C# 领域。我正在开发一个应用程序，我必须使用 fileopendialog 加载文本文件，选择文件并将其保存在组合框中，然后单击 writebutton 我应该使用文本文件中存在的数据执行一些操作。

我在 C++ 中做了如下：

if(button == m_writeButton)

    // get the data from the file
    File m_binFile = m_fileChoice->getCurrentFile();
    MemoryBlock m_data;

    m_binFile.loadFileAsData(m_data);
    size_t blockSize = m_data.getSize();

    unsigned char *f_buffer;
    f_buffer = (unsigned char *)m_data.getData();
    unsigned cnt = 0;

    // Some code

我在 C# 中做了如下：

<ComboBox Name="WriteFileCombo" >
                        <ComboBoxItem Content="Firmware To Download" />
                        <ComboBoxItem Content="Binding FirmwarePath" />
</ComboBox>
<Button Content="..." Command="Binding Path=WriteFilePathCommand" Name="FileDialogBtn"/>                       

<Button Content="Write File" Command="Binding Path=WriteFileCommand" Name="WriteFileBtn" />

查看模型类：

private string _selectedFirmware;
    public string FirmwarePath
    
        get  return _selectedFirmware; 
        set
        
            _selectedFirmware = value;
            OnPropertyChanged("FirmwarePath");
        
    

// Gets called when Browse Button (...) is clicked
private void ExecuteWriteFileDialog()
    
        var dialog = new OpenFileDialog  InitialDirectory = _defaultPath ;
        dialog.DefaultExt = ".txt";
        dialog.Filter = "TXT Files (*.txt)|*.txt";
        dialog.ShowDialog();
        FirmwarePath = dialog.FileName;

        WriteFileCommandExecuted();
    

// Gets called when Write Button is clicked
public void WriteFileCommandExecuted()
    
      // same logic as in c++
    

如何在我的 WriteFileCommandExecuted() 方法中执行与 C++ 代码中相同的操作？

请帮忙:)

【参考方案1】：

//Inside void WriteFileCommandExecuted()

 System.IO.StreamReader sr = new System.IO.StreamReader("File Path");
                textBox1.Text =  sr.ReadToEnd();

        //Or if you need more control

        System.IO.FileStream fs = new System.IO.FileStream(FirmwarePath, System.IO.FileMode.CreateNew);
        System.IO.StreamReader sr = new System.IO.StreamReader(fs);
        string textdata = sr.ReadToEnd();
        int fileSize = (int)new System.IO.FileInfo(FirmwarePath).Length;

        Byte f_buffer = new Byte();
        f_buffer = Convert.ToByte(textdata);
        int cnt = 0;

    //The FirmwarePath is the path returned to you by your file dialog box.
    //If you want to write the class you will need to instantiate is System.IO.StreamWriter then //invoke the "write" method

【讨论】：

这会读取文件并将其存储在文本框中。我想做lilmore。检查代码 :) MemoryBlock 基本上创建一个大小为 0 的未初始化块。如何在 C# 中完成 dat？

不能，C# 代码在托管环境（.Net 运行时）中运行