C#通过属性名动态访问属性值
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C# accessing property values dynamically by property name
提问by Thewads
The problem I am trying to solve is how to write a method which takes in a property name as a string, and returns the value assigned to said property.
我试图解决的问题是如何编写一个方法，该方法将属性名称作为字符串，并返回分配给该属性的值。
My model class is declared similar to:
我的模型类声明类似于：
public class Foo
{
public int FooId
public int param1
public double param2
}
and from within my method I wish to do something similar to this
从我的方法中，我希望做类似的事情
var property = GetProperty("param1)
var property2 = GetProperty("param2")
I am currently trying to do this by using Expressions such as
我目前正在尝试通过使用表达式来做到这一点，例如
public dynamic GetProperty(string _propertyName)
{
var currentVariables = m_context.Foo.OrderByDescending(x => x.FooId).FirstOrDefault();
var parameter = Expression.Parameter(typeof(Foo), "Foo");
var property = Expression.Property(parameter, _propertyName);
var lambda = Expression.Lambda<Func<GlobalVariableSet, bool>>(parameter);
}
Is this approach correct, and if so, is it possible to return this as a dynamic type?
这种方法是否正确，如果正确，是否可以将其作为动态类型返回？
Answers were correct, was making this far too complex. Solution is now:
答案是正确的，使这太复杂了。现在的解决办法是：
public dynamic GetProperty(string _propertyName)
{
var currentVariables = m_context.Foo.OrderByDescending(g => g.FooId).FirstOrDefault();
return currentVariables.GetType().GetProperty(_propertyName).GetValue(currentVariables, null);
}
采纳答案by Dzmitry Martavoi
public static object ReflectPropertyValue(object source, string property)
{
return source.GetType().GetProperty(property).GetValue(source, null);
}
回答by Sten Petrov
You're going way overboard with the samples you provide.
您提供的样品太过分了。
The method you're looking for:
您正在寻找的方法：
public static object GetPropValue( object target, string propName )
{
return target.GetType().GetProperty( propName ).GetValue(target, null);
}
But using "var" and "dynamic" and "Expression" and "Lambda"... you're bound to get lost in this code 6 months from now. Stick to simpler ways of writing it
但是使用“var”和“dynamic”以及“Expression”和“Lambda”……你一定会在 6 个月后迷失在这段代码中。坚持更简单的写作方式
