转换表达式＆lt; func＆lt; t，object＆gt;＆gt;到字符串

发布于 2025-02-04 03:37:43 字数 779 浏览 0 评论 0原文

我尝试以expression＆lt; func＆lt; persock＆gt;＆gt;将表达式转换为以后操作的字符串。

此表达式存储在类的属性中，并用于源代码生成。

示例1（这是按预期起作用的）

Expression<Func<Person,object>> exp1 = p => "abc";  
Console.WriteLine(exp1.ToString() ); // ok, p => "abc"

示例2（这具有预期的结果）：

Expression<Func<Person,object>> exp2 = p =>  Guid.NewGuid();
Console.WriteLine(exp2.ToString()); 
//the string is including a convert method:  p => Convert(NewGuid(), Object)

我希望表达式为p =＆gt; guid.newguid（），不包括convert方法：f =＆gt; convert（newguid（），对象）

转换方法中的问题是字符串表达式不可用，并且在生成的新源代码中导致汇编错误。

我需要做什么才能按照：f =＆gt; Guid.NewGuid（）没有转换方法？

原文

I try to convert an expression in the form Expression<Func<Person,object>> to a string for later manipulation.

This expression is stored in a property in a class and it's used in source code generation.

Example 1 (This works as expected)

Expression<Func<Person,object>> exp1 = p => "abc";  
Console.WriteLine(exp1.ToString() ); // ok, p => "abc"

Example 2 (This has a result that is not expected):

Expression<Func<Person,object>> exp2 = p =>  Guid.NewGuid();
Console.WriteLine(exp2.ToString()); 
//the string is including a convert method:  p => Convert(NewGuid(), Object)

I expect expression to be p => Guid.NewGuid(), without including the Convert method: f=> Convert(NewGuid(), Object)

The problem in the Convert method is the string expression is un usable and cause a compilation error in the new source code generated.

What do I need to do to get the expression as is: f => Guid.NewGuid() without a Convert method?

Demo for a test case

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空气里的味道 2025-02-11 03:37:43

通过使用仿制药，您可能会得到所需的东西。

这是一个片段。

    public static void Main()
    {
         var text1 = GetExpressionText(x => "abc");
         Console.WriteLine(text1);
         var text2 = GetExpressionText(x => Guid.NewGuid());
         Console.WriteLine(text2);
    }
    
    private static string GetExpressionText<TReturn>(Expression<Func<Person, TReturn>> expression) {
        return expression.ToString();
    }

小提琴，以便您可以进行更多的测试。

By using Generics you might get what you're looking for.

Here's a snippet.

    public static void Main()
    {
         var text1 = GetExpressionText(x => "abc");
         Console.WriteLine(text1);
         var text2 = GetExpressionText(x => Guid.NewGuid());
         Console.WriteLine(text2);
    }
    
    private static string GetExpressionText<TReturn>(Expression<Func<Person, TReturn>> expression) {
        return expression.ToString();
    }

A fiddle so you can do some more testing.

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