.Net：如何使用 TypeDescriptor.GetProperties 获取自定义属性？

发布于 2024-12-13 06:53:48 字数 450 浏览 0 评论 0原文

我创建了自己的属性来装饰我的对象。

 [AttributeUsage(AttributeTargets.All)]
    public class MyCustomAttribute : System.Attribute { }

当我尝试使用 TypeDescriptor.GetProperties 传入自定义属性时，即使类型用该属性修饰，它也不会返回任何内容。

  var props = TypeDescriptor.GetProperties(
              type, 
              new[] { new Attributes.FlatLoopValueInjection()});

如何让 TypeDescriptor.GetProperties 识别我的自定义类型？

原文

I have created my own attribute to decorate my object.

 [AttributeUsage(AttributeTargets.All)]
    public class MyCustomAttribute : System.Attribute { }

When I try to use TypeDescriptor.GetProperties passing in my custom attribute it doesn't return anything even though the type is decorated with the attribute.

  var props = TypeDescriptor.GetProperties(
              type, 
              new[] { new Attributes.FlatLoopValueInjection()});

How do I get TypeDescriptor.GetProperties to recognize my custom types?

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岁吢 2024-12-20 06:53:49

Type.GetProperties(type, Attributes[]) 方法仅返回使用指定属性数组作为过滤器，指定类型组件的属性集合。
您确定目标类型具有用您的自定义属性标记的属性，如下所示？

//...
    var props = TypeDescriptor.GetProperties(typeof(Person), new Attribute[] { new NoteAttribute() });
    PropertyDescriptor nameProperty = props["Name"];
}
//...
class Person {
    [Note]
    public string Name { get; set; }
}
//...
class NoteAttribute : Attribute {
/* implementation */
}

The Type.GetProperties(type, Attributes[]) method returns only the collection of properties for a specified type of component using a specified array of attributes as a filter.
Are you sure target type has a properties marked with your custom attributes, like this?

//...
    var props = TypeDescriptor.GetProperties(typeof(Person), new Attribute[] { new NoteAttribute() });
    PropertyDescriptor nameProperty = props["Name"];
}
//...
class Person {
    [Note]
    public string Name { get; set; }
}
//...
class NoteAttribute : Attribute {
/* implementation */
}

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ι不睡觉的鱼゛ 2024-12-20 06:53:49

更新以获取属性属性

此代码是从复制并粘贴的MSDN，这是 google 搜索“获取自定义属性反射 C#'

using System;

public class ExampleAttribute : Attribute
{
    private string stringVal;

    public ExampleAttribute()
    {
        stringVal = "This is the default string.";
    }

    public string StringValue
    {
        get { return stringVal; }
        set { stringVal = value; }
    }
}

[Example(StringValue="This is a string.")]
class Class1
{
    public static void Main()
    {
        PropertyInfo propertyInfo = typeof (Class1).GetProperties().Where(p => p.Name == "Foo").FirstOrDefault();
        foreach (object attrib in propertyInfo.GetCustomAttributes(true))
        {
            Console.WriteLine(attrib);
        }
    }

    [Example(StringValue = "property attribute")]
    public string Foo {get;set;}
}

updated to get property attribute

this code was copy and pasted from MSDN, which was the first result of the google search 'get customattribute reflection c#'

using System;

public class ExampleAttribute : Attribute
{
    private string stringVal;

    public ExampleAttribute()
    {
        stringVal = "This is the default string.";
    }

    public string StringValue
    {
        get { return stringVal; }
        set { stringVal = value; }
    }
}

[Example(StringValue="This is a string.")]
class Class1
{
    public static void Main()
    {
        PropertyInfo propertyInfo = typeof (Class1).GetProperties().Where(p => p.Name == "Foo").FirstOrDefault();
        foreach (object attrib in propertyInfo.GetCustomAttributes(true))
        {
            Console.WriteLine(attrib);
        }
    }

    [Example(StringValue = "property attribute")]
    public string Foo {get;set;}
}

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~没有更多了~