我创建了一个页面来在更新面板中显示多个用户控件.某些用户控件的加载速度会更快,而某些控件可能需要更长的时间才能加载.现在,当页面加载时,它等待所有用户控件加载并仅在此之后显示页面.但是我希望用每个加载器图像异步加载用户控件,以便轻量级用户控件可以轻松加载而无需等待较重的用户控件.
请帮我找一个解决方案.
我已使用上述方法成功将用户控件加载到我的页面中.但是现在我在加载包含标签容器,日历扩展器等ajax控件的usercontrol时遇到了困难.
解决方法
您将遇到一系列问题：ViewState,需要表单标签的控件,回发将无法工作,但如果您使用纯粹是View的控件执行此操作,它将正常工作.
脚本：
//use .ready() or pageLoad() and pass params etc if you need to
$.ajax({
type: 'POST',url: 'Default.aspx/GetControlViaAjax',data: "{}",contentType: "application/json; charset=utf-8",dataType: "json",success: function (data) {
$('#yourdiv').html(data.d);
}
});
的WebMethod：
[WebMethod]
public static string GetControlViaAjax()
{
//example public properties,send null if you don't have any
Dictionary<string,object> d = new Dictionary<string,object>();
d.Add("CssClass","YourCSSClass");
d.Add("Title","Your title");
return RenderUserControl("/yourcontrol.ascx",true,d,null,null);
//use this one if your controls are compiled into a .dll
//return RenderUserControl(null,"Com.YourNameSpace.UI","AwesomeControl");
}
渲染方法：
private static string RenderUserControl(string path,bool useFormLess,Dictionary<string,object> controlParams,string assemblyName,string controlName )
{
Page pageHolder = null;
if (useFormLess)
{
pageHolder = new FormlessPage() { AppRelativeTemplateSourceDirectory = HttpRuntime.AppDomainAppVirtualPath }; //needed to resolve "~/"
}
else
{
pageHolder = new Page() { AppRelativeTemplateSourceDirectory = HttpRuntime.AppDomainAppVirtualPath };
}
UserControl viewControl = null;
//use path by default
if(String.IsNullOrEmpty(path))
{
//load assembly and usercontrol when .ascx is compiled into a .dll
string controlAssemblyName = string.Format("{0}.{1},{0}",assemblyName,controlName );
Type type = Type.GetType(controlAssemblyName);
viewControl = (UserControl)pageHolder.LoadControl(type,null);
}
else
{
viewControl = (UserControl)pageHolder.LoadControl(path);
}
viewControl.EnableViewState = false;
if (controlParams != null && controlParams.Count > 0)
{
foreach (var pair in controlParams)
{
Type viewControlType = viewControl.GetType();
PropertyInfo property =
viewControlType.GetProperty(pair.Key);
if (property != null)
{
property.SetValue(viewControl,pair.Value,null);
}
else
{
throw new Exception(string.Format(
"UserControl: {0} does not have a public {1} property.",path,pair.Key));
}
}
}
if (useFormLess)
{
pageHolder.Controls.Add(viewControl);
}
else
{
HtmlForm form = new HtmlForm();
form.Controls.Add(viewControl);
pageHolder.Controls.Add(form);
}
StringWriter output = new StringWriter();
HttpContext.Current.Server.Execute(pageHolder,output,false);
return output.ToString();
}
FormlessPage类：
public class FormlessPage : Page
{
public override void VerifyRenderingInServerForm(Control control)
{
}
}