反射（四）CustomAttributes

最新推荐文章于 2023-12-04 15:20:52 发布

原创最新推荐文章于 2023-12-04 15:20:52 发布 · 558 阅读

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CC 4.0 BY-SA版权

这篇博客展示了如何利用C#的反射机制获取类PeoopleExample中使用了DataFieldAttribute特性的属性，包括属性名和对应的数据库字段类型。

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namespace CustomerAttribute
{
[System.AttributeUsage(System.AttributeTargets.Property)]//只能对属性 (Property) 应用属性 (Attribute)。
class DataFieldAttribute : System.Attribute
{
private string _FieldName;
private string _FieldType;
public DataFieldAttribute(string fieldname, string fieldtype)
{
this._FieldName = fieldname;
this._FieldType = fieldtype;
}
public string FieldName
{
get { return this._FieldName; }
set { this._FieldName = value; }
}
public string FieldType
{
get { return this._FieldType; }
set { this._FieldType = value; }
}
}

}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CustomerAttribute
{
public class PeoopleExample
{
string _Pl_ID;
[DataFieldAttribute("Pl_ID", "Int")]
public string Pl_ID
{
get { return _Pl_ID; }
set { _Pl_ID = value; }
}

int _PL_Age;
[DataFieldAttribute("PL_Age", "Int")]
public int PL_Age
{
get { return _PL_Age; }
set { _PL_Age = value; }
}

string _Pl_Sex;
[DataFieldAttribute("Pl_Sex", "nvarchar")]
public string Pl_Sex
{
get { return _Pl_Sex; }
set { _Pl_Sex = value; }
}

string _Pl_LoginName;
[DataFieldAttribute("Pl_LoginName", "nvarchar")]
public string Pl_LoginName
{
get { return _Pl_LoginName; }
set { _Pl_LoginName = value; }
}

string _Pl_TrueName;
[DataFieldAttribute("Pl_TrueName", "nvarchar")]
public string Pl_TrueName
{
get { return _Pl_TrueName; }
set { _Pl_TrueName = value; }
}

string _PL_Pwd;
[DataFieldAttribute("PL_Pwd", "nvarchar")]
public string PL_Pwd
{
get { return _PL_Pwd; }
set { _PL_Pwd = value; }
}

}
}

static void Main(string[] args)
{
PeoopleExample mp = new PeoopleExample();
PropertyInfo[] infos = mp.GetType().GetProperties();
string Str_TestAtrrubute = "";

object[] objDataFieldAttribute =null;

foreach (PropertyInfo info in infos)
{
objDataFieldAttribute = info.GetCustomAttributes(typeof(DataFieldAttribute), false);
if (objDataFieldAttribute != null)
{
Console.WriteLine("FieldName: " + ((DataFieldAttribute)objDataFieldAttribute[0]).FieldName + " ; FieldType:" + ((DataFieldAttribute)objDataFieldAttribute[0]).FieldType);
}
}
Console.WriteLine(Str_TestAtrrubute);
Console.ReadKey();
}