c# – 页面中用户控件的异步加载

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.

有没有解决这个问题的方法

解决方法@H_404_10@

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)
        {
        }
    }

c# – 页面中用户控件的异步加载

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