将文件拖动到丰富的文本框中以读取文件中的文本

Question

我在将文件拖放到richTextBox时遇到问题，每当我将文本文件拖动到文本文件上时，它就会变成文本文件的图片及其名称在它下面。双击该文件并使用系统默认应用程序（即文本文件的记事本等）打开它。基本上它在richTextBox中创建快捷方式，当我希望它读取文件中的文本时。在此基础上的代码，从文件文本

应该提取到richTextBox1

class DragDropRichTextBox : RichTextBox 
    { 
    public DragDropRichTextBox() 
    { 
     this.AllowDrop = true; 
     this.DragDrop += new DragEventHandler(DragDropRichTextBox_DragDrop); 
    } 

    private void DragDropRichTextBox_DragDrop(object sender, DragEventArgs e) 
    { 
     string[] fileNames = e.Data.GetData(DataFormats.FileDrop) as string[]; 

     if (fileNames != null) 
     { 
      foreach (string name in fileNames) 
      { 
       try 
       { 
        this.AppendText(File.ReadAllText(name) + "\n"); 
       } 
       catch (Exception ex) 
       { 
        MessageBox.Show(ex.Message); 
       } 
      } 
     } 
    } 

如何使这项工作任何想法？

Answer 1

在读入文件之前，您需要检查draged对象。尝试下面的代码。

public partial class Form1 : Form 
    { 
     public Form1() 
     { 
      InitializeComponent(); 
      richTextBox1.DragDrop += new DragEventHandler(richTextBox1_DragDrop); 
      richTextBox1.AllowDrop = true; 
     } 

     void richTextBox1_DragDrop(object sender, DragEventArgs e) 
     { 
      object filename = e.Data.GetData("FileDrop"); 
      if (filename != null) 
      { 
       var list = filename as string[]; 

       if (list != null && !string.IsNullOrWhiteSpace(list[0])) 
       { 
        richTextBox1.Clear(); 
        richTextBox1.LoadFile(list[0], RichTextBoxStreamType.PlainText); 
       } 

      } 
     } 

Answer 2

使用这种结合dragEnter事件和Designer.cs

this.richTextBox1.AllowDrop = true; this.richTextBox1.DragDrop += new System.Windows.Forms.DragEventHandler(this.textBox1_DragDrop); this.richTextBox1.DragEnter += new System.Windows.Forms.DragEventHandler(this.textBox1_DragEnter); 

private void textBox1_DragDrop(object sender, DragEventArgs e) 
      { 
       try 
       { 
        Array a = (Array)e.Data.GetData(DataFormats.FileDrop); 
        if (a != null) 
        { 
         string s = a.GetValue(0).ToString(); 
         this.Activate(); 
         OpenFile(s); 
        } 
       } 
       catch (Exception ex) 
       { 
        MessageBox.Show("Error in DragDrop function: " + ex.Message); 
       } 

      } 

      private void OpenFile(string sFile) 
      { 
       try 
       { 
        StreamReader StreamReader1 = new StreamReader(sFile); 
        richTextBox1.Text = StreamReader1.ReadToEnd(); 
        StreamReader1.Close(); 
       } 
       catch (Exception ex) 
       { 
        MessageBox.Show(this, ex.Message, "Error loading from file"); 
       } 

      } 

      private void textBox1_DragEnter(object sender, DragEventArgs e) 
      { 
       if (e.Data.GetDataPresent(DataFormats.FileDrop)) 
        e.Effect = DragDropEffects.Copy; 
       else 
        e.Effect = DragDropEffects.None; 

      }