using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using mshtml;namespace WindowsFormsApplication1
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void Form1_Load(object sender, EventArgs e){webBrowser1.DocumentText = @"2013-12-07 19:14:20";webBrowser1.Document.ExecCommand("EditMode", false, null);}/*function getSelectionStart(){var range=document.selection.createRange();range.moveStart('character', -document.body.innerText.length);return range.text.length;}*/private int getSelectionStart(WebBrowser webBrowser){try{IHTMLDocument2 document = (IHTMLDocument2)webBrowser.Document.DomDocument;IHTMLTxtRange range = (IHTMLTxtRange)document.selection.createRange();range.moveStart("character", -document.body.innerText.Length);return range.text.Length;}catch (System.Exception ex){//MessageBox.Show(ex.Message);//当光标在0这个位置使用功能引起错误return 0;}}/*function getSelectionLength(){return document.selection.createRange().text.length;}*/private int getSelectionLength(WebBrowser webBrowser){try{IHTMLDocument2 document = (IHTMLDocument2)webBrowser.Document.DomDocument;IHTMLTxtRange range = (IHTMLTxtRange)document.selection.createRange();return range.text.Length;}catch (System.Exception ex){return 0;//当光标在0这个位置使用功能引起错误
            }}/*     function setSelection(start,length){var range=document.selection.createRange();range.collapse(true);range.moveStart('character', start);range.moveEnd('character', length);range.select();}*/public void setSelection(WebBrowser webBrowser, int start, int length){IHTMLDocument2 document = (IHTMLDocument2)webBrowser.Document.DomDocument;IHTMLTxtRange range = (IHTMLTxtRange)document.selection.createRange();range.collapse(true);range.move("textedit", -1);  //光标移动到第0位处range.moveStart("character", start);range.moveEnd("character", length);range.select();}//选中指定的字符串private void button1_Click(object sender, EventArgs e){webBrowser1.Document.Focus();setSelection(webBrowser1, 0, 4);}//光标所在的位置private void button2_Click(object sender, EventArgs e){webBrowser1.Document.Focus();int i = (int)getSelectionStart(webBrowser1);Text = i.ToString();}//选中的字符串长度private void button3_Click(object sender, EventArgs e){webBrowser1.Document.Focus();Text = getSelectionLength(webBrowser1).ToString();}//设置光标的位置private void button4_Click(object sender, EventArgs e){webBrowser1.Document.Focus();setSelection(webBrowser1, 6, 0);}}
}

"<script>
function getCommandValue(commandId){return document.queryCommandValue(commandId);
}
function getSelectionStart(){var range=document.selection.createRange();range.moveStart('character', -document.body.innerText.length);return range.text.length;
}
function getSelectionLength(){return document.selection.createRange().text.length;
}
function setSelection(start,length){var range=document.selection.createRange();range.collapse(true);range.moveStart('character', start);range.moveEnd('character', length);range.select();
}
</script>"