我创建了一个页面来显示更新面板内的多个用户控件。一些用户控件将加载得更快,而一些可能需要更长的时间来加载。现在,当页面加载时,它会等待所有用户控件加载完毕,然后才显示页面。但是我想用每个用户控件的加载器图像异步加载用户控件,这样轻量级的用户控件就可以轻松加载,而无需等待较重的用户控件。
请帮我找到解决办法。
我已经使用上述方法成功地将用户控件加载到我的页面中。但是现在我在加载包含 ajax 控件(例如选项卡容器、日历扩展器等)的用户控件时遇到困难。
这个问题有解决办法吗
最佳答案
您会遇到很多问题:ViewState、需要表单标签的控件、回发将不起作用,但如果您使用纯 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);
}
});
网络方法:
[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, true, d, "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)
{
}
}
关于c# - 在页面中异步加载用户控件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8295995/