级联下拉列表中的方法错误500 [英] Method Error 500 on cascading dropdownlist

问题描述

这是我用来从数据库中检索数据的Web服务（我为它使用了数据集）。它在IIS上运行正常但是当我在Web服务器上传它时它会给出方法错误500.

 [WebService（Namespace =   http://tempuri.org/）] 
 [WebServiceBinding（ConformsTo = WsiProfiles.BasicProfile1_1）] 
 [System.Web.Script.Services.ScriptService] 
 public  class  ReceiptService：System.Web.Services.WebService 
 {
 public ReceiptService（）{
 
  //  如果使用设计的组件，则取消注释以下行 
  //   InitializeComponent（）;  
} 
 [WebMethod] 
 public CascadingDropDownNameValue [] GetSchoolName（ string  knownCategoryValues，  string  category）
 {
 dsScoolTableAdapters.school_detailTableAdapter school_detailAdapter = new dsScoolTableAdapters.school_detailTableAdapter（）;    
 dsScool.school_detailDataTable schools = school_detailAdapter.GetSchoolName（）;    
列表< CascadingDropDownNameValue> values = new List< CascadingDropDownNameValue>（）;    
 foreach（学校的DataRow博士）
 {
  string  school_name =（ string ）dr [  school_name] ;    
  string  district =（ string ）dr [  district] ;    
值。添加（新CascadingDropDownNameValue（school_name，school_name.ToString（））） ;    
} 
返回值.ToArray（）;    
} 
 
 
} 

解决方案

500内部服务器错误是服务器端错误，这意味着问题不在于您的PC或Internet连接，而是网站服务器的问题。



在此处阅读有关错误500的信息： HTTP错误500内部服务器错误 [ ^ ]



此微软文章：网站管理员如何解决HTTP 500问题 - 内部服务器错误 [ ^ ]

如果有人像我显然对我一样愚蠢，问题是我遗漏了

 [System.Web.Script.Services。 ScriptServ我的网络服务声明中的
 
！ D'哦！希望这会节省一些人我花在试图追踪问题上的时间。

如果出现此问题，大量数据会尝试更改参数

中的值web.config中的maxJsonLength 

：

 <   system.web.extensions  >  
 <  脚本 >  
 <   webServices  >  
 <   jsonSerialization     maxJsonLength   =  5000000    /  >  
 <   / webServices  >  
 <   / scripting  >  
 <   / system.web.extensions  >  

此解决方案见于 http://forums.asp.net/t/1038620.aspx/2/10 [ ^ ]

This is my web service which i used to retrieve data from database (I used data set for it).It runs on IIS properly but when I upload it on web server it gives method error 500.

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]
public class ReceiptService : System.Web.Services.WebService
{
    public ReceiptService () {

        //Uncomment the following line if using designed components
        //InitializeComponent();
    }
    [WebMethod]
    public CascadingDropDownNameValue[] GetSchoolName(string knownCategoryValues, string category)
    {
        dsScoolTableAdapters.school_detailTableAdapter school_detailAdapter = new dsScoolTableAdapters.school_detailTableAdapter();
        dsScool.school_detailDataTable schools = school_detailAdapter.GetSchoolName();
        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();
        foreach (DataRow dr in schools)
        {
            string school_name = (string)dr["school_name"];
            string district = (string)dr["district"];
            values.Add(new CascadingDropDownNameValue(school_name, school_name.ToString()));
        }
        return values.ToArray();
    }


}

解决方案

The 500 Internal Server Error is a "server-side" error, meaning the problem is not with your PC or Internet connection but instead is a problem with the web site's server.

Read about Error 500 here: HTTP Error 500 Internal server error[^]

Also this microsoft article: How Web site administrators can troubleshoot an "HTTP 500 - Internal Server Error"[^]

In case anyone is as dumb as I apparently am for me the issue was that I left out

[System.Web.Script.Services.ScriptService]

in my web service declaration! D'oh! Hopefully this will save someone the time I spent trying to track down the issue.

In case this problem occurres with the large amount of data try change value in the parameter

maxJsonLength

in the web.config:

<system.web.extensions>
        <scripting>
            <webServices>
                <jsonSerialization maxJsonLength="5000000" />
            </webServices>
        </scripting>
    </system.web.extensions>

this solution was found in http://forums.asp.net/t/1038620.aspx/2/10[^]

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