C＃：更新datagrid

Question

我有一個C＃應用程序與Windows窗體中的數據網格。我需要監視一個目錄（正在使用FileSystemWatcher）並使用目錄中的文件列表刷新數據網格。我不知道如何設置界面來做到這一點？從窗口形式的Load（）調用monitorDirectory（）似乎不起作用，因爲Load在應用程序中只調用一次。

感謝

Answer 1

您可以更新給onChanged或您的FileSystemWatcher的的OnRenamed事件處理程序中的網格。

以下鏈接中的示例是處理控制檯應用程序中的事件。 MSDN FileSystemWatcher Class

Answer 2

Detecting File Changes with FileSystemWatcher有如何使用FileSystemWatcher

Answer 3

您可以收聽到來自FileSystemWatcher的對象事件一個很好的例子。 MSDN page發佈了一些關於如何做到這一點的建議。

本質上，在調用MonitorDirectory（）之前，您應該訂閱FileSystemWatcher的Changed，Created，Deleted和Renamed事件。

Answer 4

全碼

添加Form1以項目

更換Form1.Designer.cs與

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; 
} 
} 

與

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(); 
    } 
} 
}