c# 4.0 获取类属性（指定的属性和attribute.data）

发布于 2024-10-30 19:18:11 字数 852 浏览 1 评论 0原文

我想知道我的类的哪些属性具有带有具体字符串的确切属性。我有这个实现（属性和类）：

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public class IsDbMandatory : System.Attribute
{
    public readonly string tableField;

    public IsDbMandatory (string tableField)
    {
        this.tableField= TableField;
    }
}

public Class MyClass 
{
    [IsDbMandatory("ID")]
    public int MyID { get; set; }
}

然后我以这种方式获取具有具体属性的属性：

public class MyService
{
   public bool MyMethod(Type theType, string myAttributeValue)
   {            
       PropertyInfo props = 
           theType.GetProperties().
                  Where(prop => Attribute.IsDefined(prop, typeof(IsDbMandatory))); 
   }
}

但我只需要具有具体属性 isDbMandatory 和具体字符串 myAttributeValue 里面。

我该怎么办？

原文

I would like to get what properties of my class have an exact attribute with a concrete string. I have this implementation (Attribute and Class):

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public class IsDbMandatory : System.Attribute
{
    public readonly string tableField;

    public IsDbMandatory (string tableField)
    {
        this.tableField= TableField;
    }
}

public Class MyClass 
{
    [IsDbMandatory("ID")]
    public int MyID { get; set; }
}

Then I get the property with the concrete attribute in this way:

public class MyService
{
   public bool MyMethod(Type theType, string myAttributeValue)
   {            
       PropertyInfo props = 
           theType.GetProperties().
                  Where(prop => Attribute.IsDefined(prop, typeof(IsDbMandatory))); 
   }
}

But I need only the properties with concrete attribute isDbMandatory AND concrete string myAttributeValue inside.

How can I do it ?

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恍梦境° 2024-11-06 19:18:11

var props = theType
    .GetProperties()
    .Where(
        prop => ((IsDbMandatory[])prop
            .GetCustomAttributes(typeof(IsDbMandatory), false))
            .Any(att => att.tableField == "blabla")
    );

var props = theType
    .GetProperties()
    .Where(
        prop => ((IsDbMandatory[])prop
            .GetCustomAttributes(typeof(IsDbMandatory), false))
            .Any(att => att.tableField == "blabla")
    );

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