XmlSerializer函数。FromTypes不会抛出异常，但它会泄漏内存。这就是为什么你需要为每个类型缓存这样的序列化器，以避免内存泄漏为每个创建的实例。

创建自己的XmlSerializer工厂并简单地使用它:

XmlSerializer serializer = XmlSerializerFactoryNoThrow.Create(typeof(MyType));

工厂是这样的:

public static class XmlSerializerFactoryNoThrow
{
    public static Dictionary<Type, XmlSerializer> _cache = new Dictionary<Type, XmlSerializer>();

    private static object SyncRootCache = new object();        

    /// <summary>
    /// //the constructor XmlSerializer.FromTypes does not throw exception, but it is said that it causes memory leaks
    /// http://stackoverflow.com/questions/1127431/xmlserializer-giving-filenotfoundexception-at-constructor
    /// That is why I use dictionary to cache the serializers my self.
    /// </summary>
    public static XmlSerializer Create(Type type)
    {
        XmlSerializer serializer;

        lock (SyncRootCache)
        {
            if (_cache.TryGetValue(type, out serializer))
                return serializer;
        }

        lock (type) //multiple variable of type of one type is same instance
        {
            //constructor XmlSerializer.FromTypes does not throw the first chance exception           
            serializer = XmlSerializer.FromTypes(new[] { type })[0];
            //serializer = XmlSerializerFactoryNoThrow.Create(type);
        }

        lock (SyncRootCache)
        {
            _cache[type] = serializer;
        }
        return serializer;
    }       
}

更复杂的版本，没有内存泄漏的可能性(请有人检查代码):

    public static XmlSerializer Create(Type type)
    {
        XmlSerializer serializer;

        lock (SyncRootCache)
        {
            if (_cache.TryGetValue(type, out serializer))
                return serializer;
        }

        lock (type) //multiple variable of type of one type is same instance
        {
            lock (SyncRootCache)
            {
                if (_cache.TryGetValue(type, out serializer))
                    return serializer;
            }
            serializer = XmlSerializer.FromTypes(new[] { type })[0];
            lock (SyncRootCache)
            {
                _cache[type] = serializer;
            }
        }          
        return serializer;
    }       
}

我也有同样的问题，直到我使用第三方工具从XSD生成类，它工作了!我发现这个工具在类的顶部添加了一些额外的代码。当我把同样的代码添加到我原来的类的顶部时，它起作用了。以下是我添加的内容……

#pragma warning disable
namespace MyNamespace
{
  using System;
  using System.Diagnostics;
  using System.Xml.Serialization;
  using System.Collections;
  using System.Xml.Schema;
  using System.ComponentModel;
  using System.Xml;
  using System.Collections.Generic;

  [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.6.1064.2")]
  [System.SerializableAttribute()]
  [System.Diagnostics.DebuggerStepThroughAttribute()]
  [System.ComponentModel.DesignerCategoryAttribute("code")]
  [System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
  [System.Xml.Serialization.XmlRootAttribute(Namespace = "", IsNullable = false)]
  public partial class MyClassName
  {
  ...

另一方面，对编译错误进行故障排除是非常复杂的。这些问题在FileNotFoundException异常中显示，并显示如下信息:

File or assembly name abcdef.dll, or one of its dependencies, was not found. File name: "abcdef.dll"
   at System.Reflection.Assembly.nLoad( ... )
   at System.Reflection.Assembly.InternalLoad( ... )
   at System.Reflection.Assembly.Load(...)
   at System.CodeDom.Compiler.CompilerResults.get_CompiledAssembly() 

You may wonder what a file not found exception has to do with instantiating a serializer object, but remember: the constructor writes C# files and tries to compile them. The call stack of this exception provides some good information to support that suspicion. The exception occurred while the XmlSerializer attempted to load an assembly generated by CodeDOM calling the System.Reflection.Assembly.Load method. The exception does not provide an explanation as to why the assembly that the XmlSerializer was supposed to create was not present. In general, the assembly is not present because the compilation failed, which may happen because, under rare circumstances, the serialization attributes produce code that the C# compiler fails to compile.

请注意 当XmlSerializer在不能访问临时目录的帐户或安全环境下运行时，也会发生此错误。

来源: http://msdn.microsoft.com/en-us/library/aa302290.aspx

有一个变通的办法。如果你使用

XmlSerializer lizer = XmlSerializer.FromTypes(new[] { typeof(MyType) })[0];

它应该避免这种异常。这对我很管用。

警告:不要多次使用，否则会出现内存泄漏

如果多次使用此方法为同一类型创建XmlSerializer实例，将会导致内存严重泄漏!

这是因为该方法绕过了内置缓存提供的XmlSerializer(type)和XmlSerializer(type, defaultNameSpace)构造函数(所有其他构造函数也绕过缓存)。

如果使用任何方法来创建XmlSerializer，而不是通过这两个构造函数，那么必须实现自己的缓存，否则会导致内存泄漏。

在Visual Studio项目属性(“Build”页面，如果我没记错的话)中有一个选项显示“生成序列化程序集”。尝试为生成[包含MyType的程序集]的项目打开该选项。

在Visual Studio项目属性中，有一个选项显示“生成序列化程序集”。尝试为生成[包含MyType的程序集]的项目打开该选项。