Service Operation返回错误类型的IEnumerable [英] Service Operation return IEnumerable of wrong type

问题描述

我有这样的服务操作：

 [WebGet] 
 public IEnumerable< string> GetDisksInfo（string machineName，string userName，string password）
 {
 List< string> result = new List< string>（）; 
 
 ConnectionOptions oConn = new ConnectionOptions（）; 
 oConn.Username = Uri.UnescapeDataString（userName）; 
 oConn.Password = Uri.UnescapeDataString（password）; 
 oConn.Impersonation = ImpersonationLevel.Impersonate; 
 
 string strNameSpace = @" \\" + machineName + @" \root \ cimv2" ;; 
 
 System.Management.ManagementScope oMs = new System.Management.ManagementScope（strNameSpace，oConn）; 
 
 
 //获取固定磁盘统计信息
 
 System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery（" select WinSp_DocicalDisk中的FreeSpace，大小，名称）其中DriveType = 3"）; 
 
 //执行查询
 ManagementObjectSearcher oSearcher = new ManagementObjectSearcher（oMs，oQuery）; 
 
 //获取结果
 ManagementObjectCollection oReturnCollection = oSearcher.Get（）; 
 
 //遍历找到的驱动器并写出信息
 foreach（管理对象oReturn in oReturnCollection）
 {
 
 result.Add（oReturn ["命名"]的ToString（）删除（1））; 
 double gb = Math.Round（（Convert.ToDouble（oReturn [" Size"]））/ 1073741824.00，2）; 
 result.Add（gb.ToString（））; 
 gb = Math.Round（（Convert.ToDouble（oReturn [" FreeSpace"]））/ 1073741824.00,2）; 
 result.Add（gb.ToString（））; 
} 
 
返回结果; 
} 

当我运行此服务操作时，值将返回为类型'element'而不是字符串，如下所示：

<？xml version =" 1.0"编码= QUOT; UTF-8英寸;？> 
  - < GetDisksInfo xmlns =" http://schemas.microsoft.com/ado/2007/08/dataservices"的xmlns：M =" HTTP：//schemas.microsoft.com/ado/2007/08/dataservices/metadata"> 
< element> C< / element> 
< element> 269.4< / element> 
< element> 249.18< / element> 
< element> D< / element> 
< element> 10< / element> 
< element> 9.92< / element> 
< / GetDisksInfo> 

任何想法为什么？在此先感谢！

解决方案

这是原始值集合的XML表示形式，如字符串。

http://www.odata.org/media/30002/OData% 20Atom％20Format.html＃collectionofsimpletypedproperties

I have a service operation like this:

 [WebGet]
        public IEnumerable<string> GetDisksInfo(string machineName, string userName, string password)
        {
            List<string> result = new List<string>();

            ConnectionOptions oConn = new ConnectionOptions();
            oConn.Username = Uri.UnescapeDataString(userName);
            oConn.Password = Uri.UnescapeDataString(password);
            oConn.Impersonation = ImpersonationLevel.Impersonate;

            string strNameSpace = @"\\" + machineName + @"\root\cimv2";

            System.Management.ManagementScope oMs = new System.Management.ManagementScope(strNameSpace, oConn);


            //get Fixed disk stats

            System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery("select FreeSpace,Size,Name from Win32_LogicalDisk where DriveType = 3");

            //Execute the query
            ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs, oQuery);

            //Get the results
            ManagementObjectCollection oReturnCollection = oSearcher.Get();

            //loop through found drives and write out info
            foreach (ManagementObject oReturn in oReturnCollection)
            {
               
                result.Add(oReturn["Name"].ToString().Remove(1));
                double gb = Math.Round((Convert.ToDouble(oReturn["Size"])) / 1073741824.00, 2);
                result.Add(gb.ToString());
                gb = Math.Round((Convert.ToDouble(oReturn["FreeSpace"])) / 1073741824.00, 2);
                result.Add(gb.ToString());
            }

            return result;
        }

when i run this service operation, the values are returned as type 'element' instead of strings, like this:

<?xml version="1.0" encoding="UTF-8"?>
-<GetDisksInfo xmlns="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
<element>C</element>
<element>269.4</element>
<element>249.18</element>
<element>D</element>
<element>10</element>
<element>9.92</element>
</GetDisksInfo>

Any ideas why? Thanks in advance!

解决方案

This is the XML representation for a collection of primitive values, like strings.

http://www.odata.org/media/30002/OData%20Atom%20Format.html#collectionofsimpletypedproperties

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