优化ASP.NET应用性能之ViewState篇
然后我们在派生于类Page的页面控制基类中重载方法LoadPageStateFromPersistenceMedium()与SavePageStateToPersistenceMedium(Object viewState),代码如下:
将上述LoadPageStateFromPersistenceMedium()方法体中的代码:
经过以上处理,web输出页面中的源代码就是型如:Load & Save ViewState DataLoad & Save ViewState Data#region Load & Save ViewState Data
protected override object LoadPageStateFromPersistenceMedium()
...{
//从自己注册的隐藏域__SmartViewState中读取数据
string viewState = Request.Form["__SmartViewState"];
byte[] bytes = Convert.FromBase64String(viewState);
//调用上面提供的静态方法CompressionHelper.DeCompressByte()来解压数据
bytes = CompressionHelper.DeCompressByte(bytes);
LosFormatter formatter = new LosFormatter();
return formatter.Deserialize(Convert.ToBase64String(bytes));
}
protected override void SavePageStateToPersistenceMedium(Object viewState)
...{
LosFormatter formatter = new LosFormatter();
StringWriter writer = new StringWriter();
formatter.Serialize(writer, viewState);
string viewStateString = writer.ToString();
byte[] bytes = Convert.FromBase64String(viewStateString);
//调用上面提供的静态方法CompressionHelper.CompressByte()来压缩数据
bytes = CompressionHelper.CompressByte(bytes);
//注册一个新的隐藏域__SmartViewState,你也可以自己定义
this.RegisterHiddenField("__SmartViewState", Convert.ToBase64String(bytes));
}
#endregion
原来的隐藏域"__VIEWSTATE"值为空,而取而代之的是我们自己注册的新的隐藏域"__SmartViewState"来存储了经过压缩后的字符串,这样以来,提速效果是明显的,结合我们的项目,象DG3G.COM的首页原ViewState串值大约是28K,压缩后为7K,而Acafa.com的首页原ViewState串值大约是43K,压缩后为8K。这样的处理还是比较令人满意的。当然,如果你觉得还不够彻底,你还可以把ViewState串存储在Session中,不过这样做,对服务器内存的压力将陡增(尤其是访问量较大的时候),建议还是不要轻易使用,如果你Web服务器内存有个10G、8G的,不妨试试。下面给出相关修改代码:<input type="hidden" name="__SmartViewState" value="H4sIAPtPoNwA/81ce1PbWJb/ ……
<input type="hidden" name="__VIEWSTATE" value="" />
将上述LoadPageStateFromPersistenceMedium()方法体中的代码:
修改为:string viewState = Request.Form["__SmartViewState"];
同时,将上述SavePageStateToPersistenceMedium()体中的代码:string viewState = Session["__SmartViewState"].ToString();
修改为:this.RegisterHiddenField("__SmartViewState", Convert.ToBase64String(bytes));
末了,以上代码和方案均来自VS2003开发实践,对VS2005是否合适,本人不做任何承诺,不过如果你能从以上方案中有所收获,我将感到无比的高兴。Session["__SmartViewState"] = Convert.ToBase64String(bytes);
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