获得“基本”数据类型，而不是怪异可空一体，通过反射在C＃ [英] Getting 'basic' datatype rather than weird nullable one, via reflection in c#

问题描述

我的基本需要是从一个LINQ生成的SQL查询匿名类型得到的数据类型。

我有一段代码（聪明，比我可以写，因为我还没有真正钻研反射）从一个匿名类型返回的数据类型，并完全适用于标注在LINQ2SQL特性不能为空的元素。所以，如果我有一个字符串将返回为System.String。然而，当元素为空我结束了它的全名是：

{NAME =可空 1全名= System.Nullable 1 [System.Decimal，mscorlib程序，版本= 4.0.0.0，文化=中性公钥= b77a5c561934e089]]}

我要的提取是在这样的情况下，System.Decimal类型（在字符串或什么的情况下，我只是想System.String）。我已经通过属性看，找不到任何东西，似乎存储此

 私有静态字典<字符串类型> ; GetFieldsForType< T>（IEnumerable的< T>数据）
 {
对象o = data.First（）; 
 
变种属性= o.GetType（）的GetProperties（）; 
 
返回properties.ToDictionary（财产= GT; property.Name，财产= GT; property.PropertyType）; 
} 
  

LINQ查询（我不认为真正的问题在这里）：

  VAR海图=从R IN db.tblTestEdits选择新{myitem = r.textField，mydecimal = r.decimalField}; 
  

我发现这个链接，似乎试图解决类似的事情。结果
http://ysgitdiary.blogspot.com/2010/02/blog-post.html

虽然它似乎返回的类型是什么，而不是实际的类型，这正是我需要的弦。不知道如何转换这样的事情。

非常感谢所有。

解决方案

 私有静态类型GetCoreType（类型类型）
 {
如果（type.IsGenericType&安培;&安培; 
 type.GetGenericTypeDefinition（）== typeof运算（可空<>））
返回Nullable.GetUnderlyingType（类型）; 
，否则
返回类型; 
} 
  

My basic need is to get the datatypes from an anonymous type generated from a LINQ to SQL query.

I have a piece of code (cleverer than I could write, since I haven't really delved into reflection) which returns the datatypes from an anonymous types, and works perfectly for the elements marked 'not nullable' in the linq2sql properties. So, if I have a string it will return as System.String. However, when the element is nullable I end up with the 'full name' of it being:

{Name = "Nullable1" FullName = "System.Nullable1[[System.Decimal, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]"}

All I want to extract is the System.Decimal type in such a case (and in cases of strings or whatever, I'd just want System.String). I've looked through the properties and can't find anything that seems to store this.

    private static Dictionary<string, Type> GetFieldsForType<T>(IEnumerable<T> data)
    {
        object o = data.First();

        var properties = o.GetType().GetProperties();

        return properties.ToDictionary(property => property.Name, property => property.PropertyType);
    }

The LINQ query (which I don't think really matters here):

var theData = from r in db.tblTestEdits select new { myitem = r.textField, mydecimal = r.decimalField }; 

I found this link that seems to try to address a similar thing.
http://ysgitdiary.blogspot.com/2010/02/blog-post.html

Though it seems to return a "string" of what the type is rather than the actual type, which is what I need. Not sure how to convert such a thing.

Many thanks all.

解决方案

private static Type GetCoreType(Type type)
{
    if (type.IsGenericType &&
        type.GetGenericTypeDefinition() == typeof(Nullable<>))
        return Nullable.GetUnderlyingType(type);
    else
        return type;
}

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