C#：更新数据网格

Question

我有一个带有 Windows 窗体数据网格的 C# 应用程序。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 窗体 Load() 调用 monitorDirectory() 似乎不起作用，因为 Load 在应用程序中仅调用一次。

谢谢

Answer 1

您可以在 FileSystemWatcher 的 OnChanged 或 OnRenamed 事件处理程序中更新网格。

下面链接中的示例正在处理控制台应用程序中的事件。
MSDN FileSystemWatcher 类

Answer 2

使用 FileSystemWatcher 检测文件更改 有一个很好的示例，说明如何使用 FileSystemWatcher

Answer 3

您可以侦听来自 FileSystemWatcher 对象的事件。 MSDN 页面发布了一些有关如何操作的建议这。

本质上，在调用 MonitorDirectory() 之前，您应该订阅 FileSystemWatcher 的 Changed、Created、Deleted 和 Renamed 事件。

Answer 4

完整代码

将 Form1 添加到您的项目

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();
    }
}
}