从wcf服务返回html [英] return html from wcf service

问题描述

我有一个web服务，我需要返回一个包含html的字符串。该html是Select控件的标记（用于jqGrid搜索过滤器），例如

 < select>< option id ='1'>值1< / option>< / select> 
  

我的WCF Web服务包含一个将该值作为字符串返回的方法...

  public string GetLeadTypeSelect（）
 {
 return< select>< option id ='1'>值1< / option>< / select>; 
} 
  

此方法的合约为：

  [OperationContract] 
 [WebInvoke（Method =GET，
 BodyStyle = WebMessageBodyStyle.Bare，
 ResponseFormat = WebMessageFormat。 Json）] 
 string GetLeadTypeSelect（）; 
  

我的问题是转义字符被插入到字符串中，因此呈现返回的HTML无用 - 服务返回这：

 < select>< option id ='1'> value 1< \ / option> < \ /选择>中
  

引号和转义'/'在结束时< option> 和< select> 标签都会导致问题。

jqGrid使用返回的HTML显示下拉菜单...

  filterModel：[
 {label：'Type'，name：'type'，stype：'select'，surl：'../../../Services/Leads/GetLeads.svc/GetLeadTypeSelect'}，
  

所以，我的问题是，如何从此Web服务将纯HTML返回给客户端，以便它可以插入进入我的HTML页面？

在此先感谢您的任何帮助，
Colin。

解决方法

我知道这是一个旧帖子，但对于只能在IIS中托管的服务，这是一种简单的方法来返回html：

  [AspNetCompatibilityRequirements（RequirementsMode = AspNetCompatibilityRequirementsMode.Required）] 
 public Stream getHtml（）
 {
 //获取html 
 var html = DoSomethingToGetHtml（）; //不是内置的.Net方法;）
 
 //我们希望我们的结果解释为纯html 
 WebOperationContext.Current.OutgoingResponse.ContentType =text / html; charset = utf -8\" ; 
 
 //从我们的html中创建一个流，因为尝试返回一个字符串会为响应添加一个额外的头标记
 //。返回一个流自身返回html 
 var result = new MemoryStream（Encoding.UTF8.GetBytes（html））; 
 
 //返回结果
返回结果; 
} 
  

此代码在托管服务的web.config中需要以下内容：

 < system.serviceModel> 
<！ - 通过设置aspNetCompatibilityEnabled = true  - >来启用HttpContext.Current。 
< serviceHostingEnvironment aspNetCompatibilityEnabled =true/> 
 
<行为> 
< endpointBehaviors> 
< behavior name =webHttpEnabled> 
< webHttp /> 
< /行为> 
< / endpointBehaviors> 
< /行为> 
 ... 
< system.serviceModel> 
  

在服务配置中，设置 behaviorConfiguration =webHttpEnabled



以这种方式返回html会限制服务的可重用性，但如果您确信自己确实可以轻松解决问题该服务将始终托管在IIS中。

I have a web service from which I need to return a string containing html. This html is the markup for a Select control (for use in jqGrid search filters), e.g.

<select><option id='1'> value 1 </option></select>  

My WCF web service contains a method that returns this value as a string...

public string GetLeadTypeSelect()
{
    return "<select><option id='1'> value 1 </option></select>";
}  

and the contract for this method is :

[OperationContract]
[WebInvoke(Method = "GET",
    BodyStyle = WebMessageBodyStyle.Bare,
    ResponseFormat = WebMessageFormat.Json)]
string GetLeadTypeSelect();  

My problem is that escape characters are inserted into the string so rendering the returned HTML useless - the service returns this :

"<select><option id='1'> value 1 <\/option><\/select>"  

The quotation marks and the escaped '/' in the closing <option> and <select> tags both cause problems.

jqGrid uses the returned HTML to display the dropdown...

filterModel: [
    { label: 'Type', name: 'type', stype: 'select', surl: '../../../Services/Leads/GetLeads.svc/GetLeadTypeSelect' },

So, my question is, how to I return pure HTML back to the client from this web service so that it can be inserted into my HTML page?

Thanks in advance for any help, Colin.

解决方案

I know this is an old post, but for a service that will only be hosted in IIS, here is an easy way to return html:

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
public Stream getHtml()
{
    // get the html
    var html = DoSomethingToGetHtml();  //Not a built-in .Net method ;)

    // we want our result interpreted as plain html
    WebOperationContext.Current.OutgoingResponse.ContentType = "text/html; charset=utf-8";

    // create a stream from our html because trying to return a string adds an extra header tag
    //      to the response.  Returning a stream returns the html by itself
    var result = new MemoryStream(Encoding.UTF8.GetBytes(html));

    // return the result
    return result;
}

This code requires the following in the web.config hosting the service:

<system.serviceModel>
    <!-- enable HttpContext.Current by setting aspNetCompatibilityEnabled=true-->
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>

    <behaviors>
        <endpointBehaviors>
            <behavior name="webHttpEnabled">              
                <webHttp/>
            </behavior>
        </endpointBehaviors>
    </behaviors>
    ...
<system.serviceModel>

In the configuration for the service, set behaviorConfiguration="webHttpEnabled".

Returning html in this way limits the reusability of the service a bit, but it's an easy way to solve the problem if you're reasonably sure the service will always be hosted in IIS.

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