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  • 如何使用ASP.NET2.0的“嵌入的资源”(转)

    这里我们要介绍的内容将让这些资源变得更加简洁。

    通常我们在ASP.NET2.0中使用嵌入的资源的时候只需完成以下几步:

    1.添加资源文件,如:

    resource

    2.将资源文件的编译方式变为“嵌入的资源”,如:

    embededResource

    3.添加Assembly信息(AssemblyInfo.CS或者在具体类的namespace之上),如:

    [assembly: System.Web.UI.WebResource("IntelligenceTextBox.JScript.IntelligenceTextBox.js", "application/x-javascript")]
    [assembly: System.Web.UI.WebResource("IntelligenceTextBox.CSS.IntelligenceTextBoxStylesheet.css", "text/css")]

    4.将资源文件注册到页面文件中(在protected override void OnPreRender(System.EventArgs e)里),如:

    Page.ClientScript.RegisterClientScriptResource(this.GetType(), "IntelligenceTextBox.JScript.IntelligenceTextBox.js");

    完成这一步后的脚本文件就会在PreRender的时候输出到前台Html中。如:

    <script src="/WebResource.axd?d=XBIPl09lmgYKinSg7vem6zAjPh9zda0B5YvbMz9cdk-Dtoq3pnz_VUoa1-xOFpiq0&amp;t=633419848307656250" type="text/javascript"></script>
    
    这样就可以在页面文件中引用相关的资源文件中的内容了。
    但是我们注意到RegisterClientScriptResource在生成的时候都会当作application/x-javascript来输出,因此最终都只能得到type="text/javascript",而这样的设置则不符合其他类型资源的输入规则。为此我构建了下面这个类,仅完成了MetaType类型为text/css的资源的输出,但它很容易扩充成支持各种格式的类型,而扩充需要您做的事很少。引入资源的方式却十分简单。
    思路:
    添加资源到页面,无非就是做到如上所示的1到4点,而唯一要解决的就是不同的metaType所特定的格式不同,如:
    CSS:
    <link href="{0}" rel="stylesheet" type="text/css"/>
    JavaScript:
    <script src="{0}" type="text/javascript"></script>
    而我们的期待的表现形式则形如上文第4点所示的方式,另外需要解决的一个问题是一个页面多个资源不用重复注册的问题。
    是否添加重复资源的问题应该留给用户自行解决,因此通过提供IsResourceRegistered方法给用户进行自行判断。
    [下面的代码需要经过改造后才能通过.NET2.0编译器的编译,否则默认使用.NET3.0以上编译器可以编译,请见谅!]
    调用代码(示例):
            protected override void OnPreRender(System.EventArgs e)
            {
                base.OnPreRender(e);
                if (Page != null)
                {
                    ClientScriptHelper cs = new ClientScriptHelper(this.Page);
    
                    string cssName = "IntelligenceTextBox.CSS.IntelligenceTextBoxStylesheet.css";
                    if (!cs.IsResourceRegistered(cssName))
                        cs.RegisterResource<IntelligenceTextBox>(this, ClientScriptHelper.MetaType.TextCSS, cssName);
                    //Page.ClientScript.RegisterClientScriptResource(this.GetType(), "IntelligenceTextBox.JScript.IntelligenceTextBox.js");
                    string jsName = "IntelligenceTextBox.JScript.IntelligenceTextBox.js";
                    if (!cs.IsResourceRegistered(jsName))
                    cs.RegisterResource<IntelligenceTextBox>(this, 
                        ClientScriptHelper.MetaType.TextJavaScript,
                        jsName);
                }
            }
    源代码:
    using System.Web.UI;
    using System.Web.UI.WebControls;
    using System.Collections;
    
    namespace IntelligenceTextBox
    {
        internal class ClientScriptHelper
        {
            private IDictionary resourceActuals;
    
            /// <summary>
            /// Get the parent container (page) reference.
            /// </summary>
            /// <param name="container"></param>
            public ClientScriptHelper(Page container)
            {
                resourceActuals = container.Items;
            }
    
            /// <summary>
            /// Reigister the resource to the page.
            /// </summary>
            /// <typeparam name="T">The type of resource.</typeparam>
            /// <param name="sender">The resource.</param>
            /// <param name="metaType">The metaType of the resource.</param>
            /// <param name="resourceName">The name of the resource.</param>
            public void RegisterResource<T>(T sender, MetaType metaType, string resourceName)
                where T : Control
            {
                ResourceInfo resourceInfo = ResourceHtmlTemplateFactory(metaType, sender.Page);
                if (sender != null)
                {
                    Literal resourceLiteral = new Literal();
                    resourceLiteral.Text = string.Format(resourceInfo.HtmlTemplate,
                        sender.Page.ClientScript.GetWebResourceUrl(typeof(T), resourceName)
                    );
    
                    resourceInfo.Where.Controls.Add(resourceLiteral);
    
                    if (!resourceActuals.Contains(resourceName))
                        resourceActuals.Add(resourceName, resourceLiteral);
                }
            }
    
            /// <summary>
            /// Make sure is the resource has been registered in the current Page.
            /// </summary>
            /// <param name="resourceName">The name of the resource.</param>
            /// <returns></returns>
            public bool IsResourceRegistered(string resourceName)
            {
                return resourceActuals.Contains(resourceName);
            }
    
            /// <summary>
            /// The factory to create the right ResourceInfo for render.
            /// </summary>
            /// <param name="metaType">MetaType of the resource.</param>
            /// <param name="container">The page will contain the resource</param>
            /// <returns></returns>
            private static ResourceInfo ResourceHtmlTemplateFactory(MetaType metaType, Page container)
            {
                ResourceInfo resource = new ResourceInfo()
                {
                    HtmlTemplate = string.Empty,
                    Where = container.Header
                };
    
                if (metaType == MetaType.TextCSS)
                {
                    resource.HtmlTemplate = "\n<link href=\"{0}\" rel=\"stylesheet\" type=\"text/css\"/>";
                    resource.Where = container.Header;
                }
                else if (metaType == MetaType.TextJavaScript)
                {
                    resource.HtmlTemplate = "\n<script src=\"{0}\" type=\"text/javascript\"></script>";
                    resource.Where = container.Header;
                }
    
                //Todo: Add the other metatype ResourceInfo instance.
                
                return resource;
            }
    
            /// <summary>
            /// The infomation of resource depend on the metatype. 
            /// </summary>
            internal class ResourceInfo
            {
                /// <summary>
                /// The html syntax of the resource.
                /// e.g.
                /// text/css: \n<link href=\"{0}\" rel=\"stylesheet\" type=\"text/css\"/>
                /// </summary>
                public string HtmlTemplate { get; set; }
    
                /// <summary>
                /// The place to render the html syntax.
                /// </summary>
                public System.Web.UI.HtmlControls.HtmlControl Where { get; set; }
            }
    
            /// <summary>
            /// MetaType
            /// </summary>
            public enum MetaType
            { 
                TextCSS,
                TextJavaScript
            }
        }
    }
    本文转自:http://www.cnblogs.com/volnet/archive/2008/03/24/1120314.html(感谢作者)

    博客园大道至简

    http://www.cnblogs.com/jams742003/

    转载请注明:博客园

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  • 原文地址:https://www.cnblogs.com/jams742003/p/1567174.html
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