我一直在无休止地寻找能准确说明我的问题的话题,但找不到。
我想取一个类的属性,只是把属性作为字符串取出来!
public class Foo
{
public Foo ()
{
}
public int MyProperty { get; set; }
}
然后我想在最后有字符串“MyProperty”,像这样:
Foo f = new Foo();
string s = Helperfunction(f.MyProperty);
string Helperfunction( X )
{
string MyString;
//do something with X
return MyString;
}
仅使用辅助函数实现这有多困难? 所以输出应该是“MyProperty”
因为我不想对其进行硬编码,一旦我重构属性名称,它仍然可以在不编辑硬编码字符串的情况下工作!
最佳答案
您可以使用反射来获取名称,这是我使用的辅助类:
public static class MemberName
{
/// <summary>
/// *** WARNING - Uses reflection - use responsibly ***
/// </summary>
/// <param name="instance"></param>
/// <param name="expression"></param>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static string GetMemberName<T>(this T instance, Expression<Func<T, object>> expression)
{
return GetMemberName(expression);
}
/// <summary>
/// *** WARNING - Uses reflection - use responsibly ***
/// </summary>
/// <param name="expression"></param>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
/// <exception cref="ArgumentException"></exception>
public static string GetMemberName<T>(Expression<Func<T, object>> expression)
{
if (expression == null)
{
throw new ArgumentException("The expression cannot be null.");
}
return GetMemberName(expression.Body);
}
/// <summary>
/// *** WARNING - Uses reflection - use responsibly ***
/// </summary>
/// <param name="instance"></param>
/// <param name="expression"></param>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static string GetMemberName<T>(this T instance, Expression<Action<T>> expression)
{
return GetMemberName(expression);
}
/// <summary>
/// *** WARNING - Uses reflection - use responsibly ***
/// </summary>
/// <param name="expression"></param>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
/// <exception cref="ArgumentException"></exception>
public static string GetMemberName<T>(Expression<Action<T>> expression)
{
if (expression == null)
{
throw new ArgumentException("The expression cannot be null.");
}
return GetMemberName(expression.Body);
}
private static string GetMemberName(Expression expression)
{
if (expression == null)
{
throw new ArgumentException("The expression cannot be null.");
}
if (expression is MemberExpression)
{
// Reference type property or field
var memberExpression = (MemberExpression)expression;
return memberExpression.Member.Name;
}
if (expression is MethodCallExpression)
{
// Reference type method
var methodCallExpression = (MethodCallExpression)expression;
return methodCallExpression.Method.Name;
}
if (expression is UnaryExpression)
{
// Property, field of method returning value type
var unaryExpression = (UnaryExpression)expression;
return GetMemberName(unaryExpression);
}
throw new ArgumentException("Invalid expression");
}
private static string GetMemberName(UnaryExpression unaryExpression)
{
if (unaryExpression.Operand is MethodCallExpression)
{
var methodExpression = (MethodCallExpression)unaryExpression.Operand;
return methodExpression.Method.Name;
}
return ((MemberExpression)unaryExpression.Operand).Member.Name;
}
}
还有一个用法示例:
string propName = MemberName.GetMemberName<Foo>(x => x.MyProperty);
关于c# - 类属性的名称到字符串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24411333/