C# 为什么 GetProperty 找不到它？
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Why does GetProperty fail to find it?
提问by Remi Despres-Smyth
I'm trying to use reflection to get a property from a class. Here is some sample code of what I'm seeing:
我正在尝试使用反射从类中获取属性。这是我所看到的一些示例代码：
using System.Reflection;
namespace ConsoleApplication
{
class Program
{
static void Main(string[] args)
{
PropertyInfo[] tmp2 = typeof(TestClass).GetProperties();
PropertyInfo test = typeof(TestClass).GetProperty(
"TestProp", BindingFlags.Public | BindingFlags.NonPublic);
}
}
public class TestClass
{
public Int32 TestProp
{
get;
set;
}
}
}
When I trace through this, this is what I see:
当我跟踪这个时，这就是我所看到的：
- When I fetch all properties using
GetProperties(), the resulting array has one entry, for propertyTestProp. - When I try to fetch
TestPropusingGetProperty(), I get null back.
- 当我使用 获取所有属性时
GetProperties()，结果数组有一个条目，用于 propertyTestProp。 - 当我尝试获取
TestProp使用GetProperty()，我得空回来。
I'm a little stumped; I haven't been able to find anything in the MSDN regarding GetProperty()to explain this result to me. Any help?
我有点难住；我一直无法在 MSDN 中找到任何关于GetProperty()向我解释这个结果的内容。有什么帮助吗？
EDIT:
编辑：
If I add BindingFlags.Instanceto the GetProperties()call, no properties are found, period. This is more consistent, and leads me to believe that TestPropis not considered an instance property for some reason.
如果我添加BindingFlags.Instance到GetProperties()呼叫中，则找不到任何属性，期间。这更加一致，并使我相信TestProp由于某种原因它不被视为实例属性。
Why would that be? What do I need to do to the class for this property to be considered an instance property?
为什么会这样？我需要对类做什么才能将此属性视为实例属性？
采纳答案by Andrew Rollings
Add BindingFlags.Instanceto the GetPropertycall.
添加BindingFlags.Instance到GetProperty通话中。
EDIT: In response to comment...
编辑：回应评论...
The following code returns the property.
以下代码返回该属性。
Note: It's a good idea to actually make your property do something before you try to retrieve it (VS2005) :)
注意：在尝试检索它（VS2005）之前，最好先让你的财产做一些事情：）
using System.Reflection;
namespace ConsoleApplication
{
class Program
{
static void Main(string[] args)
{
PropertyInfo[] tmp2 = typeof(TestClass).GetProperties();
PropertyInfo test = typeof(TestClass).GetProperty(
"TestProp",
BindingFlags.Instance | BindingFlags.Public |
BindingFlags.NonPublic);
Console.WriteLine(test.Name);
}
}
public class TestClass
{
public Int32 TestProp
{
get
{
return 0;
}
set
{
}
}
}
}
回答by leppie
You need to specify whether it is static or an instance (or both) too.
您还需要指定它是静态的还是实例（或两者）。
回答by bruno conde
Try to add the following tag:
尝试添加以下标签：
System.Reflection.BindingFlags.Instance
EDIT:This works (at least to me)
编辑：这有效（至少对我而言）
PropertyInfo test = typeof(TestClass).GetProperty("TestProp", BindingFlags.Public | BindingFlags.Instance);
Console.WriteLine(test.Name);
