【C#】文件拖拽，获取文件路径

**文件拖拽功能实现**

在 C# 中，我们可以使用 Windows Forms 或 WPF 来实现文件拖拽功能。下面我们将使用 Windows Forms 来演示如何实现这个功能。

### **步骤1：创建一个 Windows Forms 应用程序**

首先，我们需要创建一个新的 Windows Forms 应用程序。在 Visual Studio 中，选择 "File" -> "New" -> "Project..."，然后选择 "Windows Forms App (.NET Framework)"，命名为 "FileDragDrop"。

### **步骤2：设计用户界面**

在 Form1.cs 文件中，我们需要添加一个 Label 控件来显示文件路径。我们还需要添加一个 PictureBox 控件来显示文件图标。

csharp// Form1.Designer.csnamespace FileDragDrop{
 partial class Form1 {
 /// <summary>
 /// 必需的设计器变量。
 /// </summary>
 private System.ComponentModel.IContainer components = null;

 /// <summary>
 /// 使用要求进行设计。请参阅  /// </summary>
 protected override void Dispose(bool disposing)
 {
 if (disposing)
 {
 if (components != null)
 {
 components.Dispose();
 }
 }

 base.Dispose(disposing);
 }

 #region Windows 窗体设计器生成的代码 /// <summary>
 /// 设计器支持所需的方法。请勿使用构造函数或过载。
 /// </summary>
 private void InitializeComponent()
 {
 this.label1 = new System.Windows.Forms.Label();
 this.pictureBox1 = new System.Windows.Forms.PictureBox();
 // // label1 // this.label1.AutoSize = true;
 this.label1.Location = new System.Drawing.Point(12,9);
 this.label1.Name = "label1";
 this.label1.Size = new System.Drawing.Size(53,12);
 this.label1.TabIndex =0;
 this.label1.Text = "文件路径：";
 // // pictureBox1 // this.pictureBox1.Location = new System.Drawing.Point(71,9);
 this.pictureBox1.Name = "pictureBox1";
 this.pictureBox1.Size = new System.Drawing.Size(100,50);
 this.pictureBox1.TabIndex =1;
 this.pictureBox1.TabStop = false;
 // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F,12F);
 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
 this.ClientSize = new System.Drawing.Size(284,261);
 this.Controls.Add(this.pictureBox1);
 this.Controls.Add(this.label1);
 this.Name = "Form1";
 this.Text = "FileDragDrop";
 this.Load += new System.EventHandler(this.Form1_Load);
 this.ResumeLayout(false);

 }

 #endregion private System.Windows.Forms.Label label1;
 private System.Windows.Forms.PictureBox pictureBox1;
 }
}

csharp// Form1.csnamespace FileDragDrop{
 public class Form1 : Form {
 private Label label1;
 private PictureBox pictureBox1;

 public Form1()
 {
 InitializeComponent();
 }

 private void Form1_Load(object sender, EventArgs e)
 {
 // 初始化控件 label1 = new Label();
 pictureBox1 = new PictureBox();

 // 添加控件到窗体 this.Controls.Add(label1);
 this.Controls.Add(pictureBox1);

 // 设置控件属性 label1.AutoSize = true;
 label1.Location = new Point(12,9);
 label1.Name = "label1";
 label1.Size = new Size(53,12);
 label1.TabIndex =0;
 label1.Text = "文件路径：";

 pictureBox1.Location = new Point(71,9);
 pictureBox1.Name = "pictureBox1";
 pictureBox1.Size = new Size(100,50);
 pictureBox1.TabIndex =1;
 pictureBox1.TabStop = false;

 // 添加事件处理程序 this.DragEnter += new DragEventHandler(Form1_DragEnter);
 this.DragDrop += new DragEventHandler(Form1_DragDrop);
 }

 private void Form1_DragEnter(object sender, DragEventArgs e)
 {
 // 检查是否为文件拖拽事件 if (e.Data.GetData(typeof(FileInfo)) != null)
 {
 e.Effect = DragDropEffects.Copy;
 }
 else {
 e.Effect = DragDropEffects.None;
 }
 }

 private void Form1_DragDrop(object sender, DragEventArgs e)
 {
 // 获取文件路径 string filePath = (string)e.Data.GetData(typeof(string));

 // 更新控件文本 label1.Text = "文件路径：" + filePath;

 // 显示文件图标 pictureBox1.Image = Image.FromFile(filePath);
 }
 }
}