无法获得Lambda表达式的Intellisense [英] Not getting Intellisense for Lambda Expression

问题描述

基本上，我已经为正在使用的Validation对象创建了一个辅助方法.代码是这样的:

Basically, I've created a helper method for a Validation object I'm using. The code is like so:

public class ValidationSet<TSource> : ValidationSet
{
    public void AddValidationErrorFor<TProperty>(Expression<Func<TSource, TProperty>> propertyLambda, string errorMessage, string data = null)
    {
        // extension method
        PropertyInfo property = propertyLambda.GetPropertyInfo();

        Add(new ValidationItem
        {
            Key = property.Name,
            Message = errorMessage,
            DataMessage = data
        });
    }
}

public class ValidationSet : List<ValidationItem>
{
    public void AddValidationError(string key, string errorMessage)
    {
        Add(new ValidationItem
        {
            Key = key,
            Message = errorMessage
        });
    }
}

有效的是，发生了什么(而且行得通)，我可以这样写:

Effectively, what happens (and this works), is that I can write something like this:

public class SomeObject
{
     public int Id { get; set; }
     public string SomeValue { get; set; }
}

然后，当我想验证它时，我可以写这样的东西:

And then when I want to validate it, I can write something like this:

ValidationSet<SomeObject> validationSet = new ValidationSet<SomeObject>();

if(SomeValue.Contains("SomeOtherValue"))
    validationSet.AddValidatorErrorFor(x => x.SomeValue, "Some Error");

当前全部编译.但是，在最后一行中，我对lambda表达式没有任何理解.我必须手动键入x.SomeValue，即使它们都可以正常编译.有谁知道获得智能感知所需的东西吗?

This all currently compiles. However, I don't get intellisense for my lambda expression in the last line. I have to manually type x.SomeValue, even though it all compiles fine. Does anyone know what is missing to get the intellisense?

推荐答案

我像这样复制了您的设置...

I reproduced your setup like so...

public class ValidateThing<TSource>
{
    public void AddValidation<TProperty>(Expression<Func<TSource, TProperty>> expr)
    {
        //...
    }
}

public static class Tester
{
    public static void Test()
    {
        ValidateThing<string> v = new ValidateThing<string>();

        v.AddValidation(s => s.Length);
    }
}

在s =>之后键入s.时，我就对String的成员有了智能感知.此代码段产生的行为与您的代码相同吗?

As soon as I typed the s. after s =>, I got intellisense for the members of String. Does this code snippet produce the same behavior as your code?

编辑:哦，我想问您使用的是哪个版本的Visual Studio是很重要的.

EDIT: Oh, I suppose it's relevant to ask what version of Visual Studio you're using.

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