DotNet OnPreRender(EventArgs e) 事件常用的方法

protected override void OnPreRender(EventArgs e) 
1) 加入脚本 

复制代码代码如下:

protected override void OnPreRender(EventArgs e) 
{ 
base.OnPreRender(e); 
this.Page.RegisterClientScriptBlock("InsertText", this.RenderScript()); 
this.Page.RegisterOnSubmitStatement("StorePostBody", "StorePostBody();"); 
} 

2) 设定标题 

复制代码代码如下:

protected override void OnPreRender(EventArgs e) 
{ 
if(_mainTitle != null) 
_mainTitle.Text = ResourceManager.GetString(Title); 
if(_subTitle != null) 
_subTitle.Text = ResourceManager.GetString(SubTitle); 
base.OnPreRender (e); 
} 

3) 设定按钮客户端事件 

复制代码代码如下:

protected override void OnPreRender(EventArgs e) 
{ 
Submit.Attributes.Add("onclick", "return SubmitSendToFriend('" + From.ClientID + "', '" + To.ClientID + "');"); 
} 

4) 设定控件的状态 

复制代码代码如下:

protected override void OnPreRender(System.EventArgs e) 
{ 
if(replyButton.Visible == false) 
((Literal)FindControl("Sep1")).Visible = false; 
if(threadSubButton.Visible == false) 
((Literal)FindControl("Sep3")).Visible = false; 
if(rateButton.Visible == false) 
((Literal)FindControl("Sep2")).Visible = false; 
base.OnPreRender (e); 
} 

5) 加入脚本块 

复制代码代码如下:

protected override void OnPreRender(EventArgs e) 
{ 
base.OnPreRender (e); 
StringBuilder sb = new StringBuilder(); 
sb.Append(" "); 
sb.Append(" function ToggleRateMenu() {"); 
sb.Append(" rateMenu = document.getElementById('RateMenu');"); 
sb.Append(" rateButton = document.getElementById('RateButton');"); 
sb.Append(""); 
sb.Append(" rateMenu.style.left = getposOffset(rateButton, \"left\");"); 
sb.Append(" rateMenu.style.top = getposOffset(rateButton, \"top\") + rateButton.offsetHeight;"); 
sb.Append(""); 
sb.Append(" if (rateMenu.style.visibility == \"hidden\") {"); 
sb.Append(" rateMenu.style.visibility = \"visible\";"); 
sb.Append(" rateMenu.style.display = 'block';"); 
sb.Append(" } else {"); 
sb.Append(" rateMenu.style.visibility = \"hidden\";"); 
sb.Append(" rateMenu.style.display = 'none';"); 
sb.Append(" }"); 
sb.Append(" }"); 
sb.Append(" "); 
sb.Append(" function getposOffset(what, offsettype){"); 
sb.Append(" var totaloffset=(offsettype==\"left\")? what.offsetLeft : what.offsetTop;"); 
sb.Append(" var parentEl=what.offsetParent;"); 
sb.Append(" while (parentEl!=null){"); 
sb.Append(" totaloffset=(offsettype==\"left\")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;"); 
sb.Append(" parentEl=parentEl.offsetParent;"); 
sb.Append(" }"); 
sb.Append(" return totaloffset;"); 
sb.Append("}"); 
sb.Append(" "); 
Page.RegisterClientScriptBlock("RatePost",sb.ToString());