LINQ to JSON:InvalidOperationException:Lambda参数不在范围内 [英] LINQ to JSON: InvalidOperationException: Lambda Parameter not in scope

问题描述

我正在尝试执行LINQ to JSON的示例代码(如下所述)，但它给了我以下错误

I am trying the execute the sample code of LINQ to JSON (mentioned below) but it is giving me following error

堆栈跟踪:

[InvalidOperationException:Lambda参数不在范围内]

[InvalidOperationException: Lambda Parameter not in scope]

我正在执行的代码是:

      JObject rss =
          new JObject(

                new JProperty("id", "James Newton-King"),
                new JProperty("name", "http://james.newtonking.com"),
                new JProperty("data", "James Newton-King's blog."),
                new JProperty("children",
                  new JArray(
                    from p in mwsysbot.Software
                    where p.SoftwareName == name
                    select new JObject(                            
                      new JProperty("id",p.SoftwareUUID),
                      new JProperty("name", p.SoftwareName)         
                    )
                  )
                 )
               );

此外，当我删除"new JProperty("name"，p.SoftwareName)"行时，代码将完美执行.

Also when I remove line "new JProperty("name", p.SoftwareName) " the code executes perfectly.

为什么?

推荐答案

我尝试了这个，对我有用...

I tried this and it worked for me...

     IQueryable<Software> soft = (from s in mwsysbot.Software
                                                     select s).ToList();

JObject rss =
           new JObject(
                     new JProperty("id", "James Newton-King"),
                     new JProperty("name", "http://james.newtonking.com"),
                     new JProperty("data", "James Newton-King's blog."),
                     new JProperty("children", new JArray(
                         from m in soft
                         select new JObject(
                             new JProperty("id",m.SoftwareName),
                             new JProperty("name", m.SoftwareName),
                             new JProperty("children",new JArray())
                             )
                         ))


             );

我不知道原因！

好像我们只能在上述位置使用"List"数据结构吗?

Is it like we can use only the "List " data structure in the above place ?

这篇关于LINQ to JSON:InvalidOperationException:Lambda参数不在范围内的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！