我有一个 C# 应用程序,它带有一个 Windows 形式的数据网格。我需要监视一个目录(正在使用 FileSystemWatcher)并使用目录中的文件列表刷新数据网格。我不确定如何设置界面来做到这一点?从 windows-form Load() 调用 monitorDirectory() 似乎不起作用,因为 Load 在应用程序中只调用一次。
谢谢
我有一个 C# 应用程序,它带有一个 Windows 形式的数据网格。我需要监视一个目录(正在使用 FileSystemWatcher)并使用目录中的文件列表刷新数据网格。我不确定如何设置界面来做到这一点?从 windows-form Load() 调用 monitorDirectory() 似乎不起作用,因为 Load 在应用程序中只调用一次。
谢谢
您可以在 FileSystemWatcher 的 OnChanged 或 OnRenamed 事件处理程序中更新您的网格。
下面链接中的示例是在控制台应用程序中处理事件。 MSDN FileSystemWatcher 类
您可以侦听来自 FileSystemWatcher 对象的事件。MSDN 页面发布了一些关于如何执行此操作的建议。
本质上,在调用 MonitorDirectory() 之前,您应该订阅 FileSystemWatcher 的 Changed、Created、Deleted 和 Renamed 事件。
完整代码
将 Form1 添加到您的项目中
将 Form1.Designer.cs 替换为
namespace Test
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.dataGridView1 = new System.Windows.Forms.DataGridView();
this.fileSystemWatcher1 = new System.IO.FileSystemWatcher();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.fileSystemWatcher1)).BeginInit();
this.SuspendLayout();
//
// dataGridView1
//
this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.dataGridView1.Location = new System.Drawing.Point(13, 13);
this.dataGridView1.Name = "dataGridView1";
this.dataGridView1.Size = new System.Drawing.Size(240, 150);
this.dataGridView1.TabIndex = 0;
//
// fileSystemWatcher1
//
this.fileSystemWatcher1.EnableRaisingEvents = true;
this.fileSystemWatcher1.Path = "c:\\Temp";
this.fileSystemWatcher1.SynchronizingObject = this;
this.fileSystemWatcher1.Changed += new System.IO.FileSystemEventHandler(this.fileSystemWatcher1_CreatedDeletedChanged);
this.fileSystemWatcher1.Created += new System.IO.FileSystemEventHandler(this.fileSystemWatcher1_CreatedDeletedChanged);
this.fileSystemWatcher1.Deleted += new System.IO.FileSystemEventHandler(this.fileSystemWatcher1_CreatedDeletedChanged);
this.fileSystemWatcher1.Renamed += new System.IO.RenamedEventHandler(this.fileSystemWatcher1_Renamed);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(370, 301);
this.Controls.Add(this.dataGridView1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.fileSystemWatcher1)).EndInit();
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.DataGridView dataGridView1;
private System.IO.FileSystemWatcher fileSystemWatcher1;
}
}
将 Form1.cs 替换为
using System;
using System.IO;
using System.Windows.Forms;
namespace Test
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void PopulateGrid()
{
DirectoryInfo dir = new DirectoryInfo(fileSystemWatcher1.Path);
dataGridView1.DataSource = dir.GetFiles();
}
private void fileSystemWatcher1_CreatedDeletedChanged(object sender, FileSystemEventArgs e)
{
PopulateGrid();
}
private void fileSystemWatcher1_Renamed(object sender, RenamedEventArgs e)
{
PopulateGrid();
}
private void Form1_Load(object sender, EventArgs e)
{
PopulateGrid();
}
}
}