调用 XmlSerializer.Deserialize 注意:会一直增加程序集。

当使用XmlSerializer(Type type,Type[] extraTypes)构造函数时：

调用Deserialize会使 应用程序域的程序集不断增加。

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml.Serialization;
using System.IO;
using System.Reflection;
using System.Collections;

namespace ConsoleApplication1
...{
    public class Class1
    ...{
        [XmlArrayItem(typeof(MyStruct))]
        public ArrayList list = new ArrayList();
        public void SaveAsXML(Stream s)
        ...{
            XmlSerializer sr = new XmlSerializer(this.GetType());
            sr.Serialize(s, this);

        }
        //多次调用没有增加程序集
        public static Class1 Deserialize1(Stream s)
        ...{
            XmlSerializer sr = new XmlSerializer(typeof(Class1));
            return (Class1)sr.Deserialize(s);
        }
        //多次调用增加了程序集
        public static Class1 Deserialize2(Stream s)
        ...{
            XmlSerializer sr = new XmlSerializer(typeof(Class1), new Type[] ...{ typeof(MyStruct) });
            return (Class1)sr.Deserialize(s);
        }

        public static void Main()
        ...{
            Assembly[] assAry = System.AppDomain.CurrentDomain.GetAssemblies();
            Console.WriteLine( "System assembly count:" + assAry.Length );
            Class1 c = new Class1();
            c.list.Add(new MyStruct()) ;
            c.list.Add(new MyStruct());
            MemoryStream ms = new System.IO.MemoryStream();
            c.SaveAsXML(ms);
          
            for (int i = 0; i < 10; i++)
            ...{
                ms.Position = 0;
                c = Class1.Deserialize1(ms);
            }
            assAry = System.AppDomain.CurrentDomain.GetAssemblies();
            Console.WriteLine( "After Deserialize1 count:" + assAry.Length);
            Console.WriteLine("====================================================");
            for (int i = 0; i < assAry.Length; i++)
            ...{
                Console.WriteLine(assAry[i].FullName.Split(',')[0]);
            }
            for (int i = 0; i < 10; i++)
            ...{
                ms.Position = 0;
                c = Class1.Deserialize2(ms);
            }
            
            assAry = System.AppDomain.CurrentDomain.GetAssemblies();
            Console.WriteLine("====================================================");
            Console.WriteLine("After Deserialize2 count:" + assAry.Length);
            for (int i = 0; i < assAry.Length; i++)
            ...{
                Console.WriteLine(assAry[i].FullName.Split(',')[0]);
            }

        }
        
    }
    public class MyStruct
    ...{
        public string name;
        public int count;
    }
}

输出：

System assembly count:4
After Deserialize1 count:6
====================================================
mscorlib
ConsoleApplication1
System.Xml
System
System.Configuration
fnti6agi
====================================================
After Deserialize2 count:16
mscorlib
ConsoleApplication1
System.Xml
System
System.Configuration
fnti6agi
ifxcgkts
yxwhgzrw
qvh_acbj
vr_plfcx
gl9akgfi
wsq5_vqc
9gyztvh4
y-29mn35
ltvgbal0
1xkjfbpn
请按任意键继续. . .