C#通过属性名访问动态属性值 [英] C# accessing property values dynamically by property name
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问题描述
我试图解决的问题是如何写这需要在属性名作为字符串的方法,并返回分配给所述属性的值。
我的模型类被声明类似于:
公共类Foo
{
公众诠释FooId
公众诠释参数1
公共双参数2
}
和从我的方法中我希望做一些类似的
VAR财产=的getProperty(参数1)
VAR property2 =的getProperty(参数2)
我目前尝试使用表达式,如
公共动态的getProperty(字符串_propertyName)
做到这一点{
变种currentVariables = m_context.Foo.OrderByDescending(X => x.FooId).FirstOrDefault();
变量参数= Expression.Parameter(typeof运算(富),富);
VAR财产= Expression.Property(参数,_propertyName);
变种的λ= Expression.Lambda< Func键< GlobalVariableSet,布尔>>(参数);
}
这是方法正确,如果是这样,是否有可能返回这是一个动态类型?
答案是正确的,是使这个过于复杂。解决方案现在是:
公共动态的getProperty(字符串_propertyName)
{
VAR currentVariables = m_context.Foo .OrderByDescending(G => g.FooId).FirstOrDefault();
返回currentVariables.GetType()的getProperty(_propertyName).GetValue(currentVariables,NULL);
}
解决方案
公共静态对象ReflectPropertyValue(对象源,字符串属性)
{
返回source.GetType()的getProperty(财产).GetValue(源,NULL);
}
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.
My model class is declared similar to:
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
var property = GetProperty("param1)
var property2 = GetProperty("param2")
I am currently trying to do this by using Expressions such as
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?
Answers were correct, was making this far too complex. Solution is now:
public dynamic GetProperty(string _propertyName)
{
var currentVariables = m_context.Foo.OrderByDescending(g => g.FooId).FirstOrDefault();
return currentVariables.GetType().GetProperty(_propertyName).GetValue(currentVariables, null);
}
解决方案
public static object ReflectPropertyValue(object source, string property)
{
return source.GetType().GetProperty(property).GetValue(source, null);
}
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