[英]Update excel spreadsheet from another thread
我已经使用C#创建了COM服务器,我的客户可以在其中接收实时更新。 通常从不同的线程触发更新。 但是我注意到,当回调方法更新电子表格时Excel崩溃。 有没有办法在UI线程中调用更新?
PS我知道Excel的RTD功能。 但这不符合我的需求,因为我一次更新需要多个参数。
您正在寻找的是ISyncronizedInvoke的Invoke / BeginInvoke方法
在您的UI线程上,进行任意控制并保留该引用...
从要触发更新的线程中,使用要在UI线程上执行的委托在该控件(控件实现ISyncronizedInvoke)上调用Invoke或BeginInvoke ...从该委托中,您可以调用COM服务器
//编辑:示例代码
using System;
using System.Windows.Forms;
using System.Threading;
using Microsoft.Office.Interop.Excel;
using System.Runtime.InteropServices;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
Thread someWorkerThread;
Microsoft.Office.Interop.Excel.Application ExApp;
Worksheet wrkSheet;
public Form1()
{
InitializeComponent();
ExApp = new Microsoft.Office.Interop.Excel.Application();
ExApp.Visible = true; // or else we won't see the window
var books = ExApp.Workbooks;
var wrkBook = books.Add();
var sheets = wrkBook.Worksheets;
wrkSheet = sheets.get_Item(1);
Marshal.ReleaseComObject(sheets);
Marshal.ReleaseComObject(wrkBook);
Marshal.ReleaseComObject(books);
someWorkerThread = new Thread(new ParameterizedThreadStart(threadHandler));
someWorkerThread.Start(this);
}
private void threadHandler(object obj)
{// this will be executed on a seperate worker thread
Control mainFrm = obj as Control;
if (mainFrm == null)
throw new ArgumentException("Need to have a Control as parameter");
for (int i = 1; i < 50;i++ )
{
Thread.Sleep(2500);
mainFrm.Invoke(new Action<int>(doStuff), i); // this will invoke the main UI thread
}
}
private void doStuff(int i)
{// this will be executed on the main UI thread
var range = wrkSheet.Range[string.Format("A{0}", i)];
range.Value = "Hello World!";
Marshal.ReleaseComObject(range);
}
#region designer stuff
/// <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.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(76, 84);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(149, 13);
this.label1.TabIndex = 0;
this.label1.Text = "I am an ordinary windows form";
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(284, 262);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Label label1;
#endregion
}
}
建议:此示例不会清除wrkSheet参考和ExApp参考...您必须在退出应用程序之前先将它们释放
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