这是我第一次使用拖放.所以我有一个带有 listbox
的表单,仅此而已.我希望能够将文件从桌面或 Windows 资源管理器拖放到我的列表框中.这是我的代码.缺少什么?
This is the first time I am working with drag and drop. So I have a form with a listbox
and nothing else. I would like to be able to drag and drop files from desktop or windows explorer into my listbox. This is my code. What is missing?
表格:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void listBox1_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
e.Effect = DragDropEffects.All;
else
e.Effect = DragDropEffects.None;
}
private void listBox1_DragDrop(object sender, DragEventArgs e)
{
string[] s = (string[])e.Data.GetData(DataFormats.FileDrop, false);
int i;
for (i = 0; i < s.Length; i++)
listBox1.Items.Add(s[i]);
}
}
Form1.Designer.cs:(初始化组件)
private void InitializeComponent()
{
this.listBox1 = new System.Windows.Forms.ListBox();
this.SuspendLayout();
//
// listBox1
//
this.listBox1.AllowDrop = true;
this.listBox1.FormattingEnabled = true;
this.listBox1.Location = new System.Drawing.Point(30, 23);
this.listBox1.Name = "listBox1";
this.listBox1.Size = new System.Drawing.Size(376, 238);
this.listBox1.TabIndex = 0;
this.listBox1.DragDrop += new System.Windows.Forms.DragEventHandler(this.listBox1_DragDrop);
this.listBox1.DragEnter += new System.Windows.Forms.DragEventHandler(this.listBox1_DragEnter);
this.listBox1.DragOver += new System.Windows.Forms.DragEventHandler(this.listBox1_DragOver);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(438, 366);
this.Controls.Add(this.listBox1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
我做了这个,我想这样就可以了.而且不需要 DragOver.
I make this and i think this will be OK.And no need DragOver.
private void listBox_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.FileDrop))
e.Effect = DragDropEffects.All;
else
e.Effect = DragDropEffects.None;
}
private void listBox_DragDrop(object sender, DragEventArgs e)
{
if (listBox.Items.Count != 0)
{
listBox.Items.Clear();
}
string[] s = (string[])e.Data.GetData(DataFormats.FileDrop, false);
int i;
for (i = 0; i < s.Length; i++)
listBox.Items.Add(Path.GetFileName(s[i]));
}
这篇关于文件拖放在列表框上不起作用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跟版网!