作者：jiankunking 出处：http://blog.csdn.net/jiankunking 

今天在开发过程中遇到了一个很恶心的问题，就是Form窗体ShowDialog的时候，直接报出下面的错误：

有关调用实时(JIT)调试而不是此对话框的详细信息，
请参见此消息的结尾。

************** 异常文本 **************
System.MissingMethodException: 找不到方法:“XXX.XXX.DataObject.SPI.DataObjectColumn[] XXX.XXX.WCFClient.WCFService.ServiceClient.DataColumn_GetListByDOID(System.String)”。
   在 XXX.XXX.Common.CommonHelp.UI.HelpForm.HelpDisplayEditorForm_Load(Object sender, EventArgs e)
   在 System.Windows.Forms.Form.OnLoad(EventArgs e)
   在 System.Windows.Forms.Form.OnCreateControl()
   在 System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   在 System.Windows.Forms.Control.CreateControl()
   在 System.Windows.Forms.Control.WmShowWindow(Message& m)
   在 System.Windows.Forms.Control.WndProc(Message& m)
   在 System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   在 System.Windows.Forms.Form.WmShowWindow(Message& m)
   在 System.Windows.Forms.Form.WndProc(Message& m)
   在 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   在 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   在 System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

将断点加在HelpDisplayEditorForm_Load函数上发现，根本进不到函数内部，就报错了。

  个人认为是Form窗体在ShowDialog函数之后，HelpDisplayEditorForm_Load函数之前发生的异常，于是上网搜资料，看微软的源码，也没什么收获。

  于是，咨询了一下同事，同事说把HelpDisplayEditorForm_Load中的所有代码屏蔽掉，看看效果。

我把HelpDisplayEditorForm_Load内所有代码屏蔽到以后，断点可以进入HelpDisplayEditorForm_Load函数内部了，然后，一部分一部分代码的放开，发现，只要到需要调用服务端方法的时候，就会报出上面的错误（所有调用WCF服务端方法的地方都会报错）。

 更新过错误提示的dll（通过dll反编译发现错误提示的函数在dll中是存在的），重启过iis等等N过方法之后，还有木有搞定。

由于，是所有WCF服务端方法均不可用，于是回头研究WCF客户端，发现WCF客户端有问题，有人在获取WCF服务端方法的时候，WCF将服务契约标识方法入参中的自定义类型、返回值是自定义类型的，均隐式进行了实体类序列化（此处的序列化指的是，将自定义类型的实体，标识成了WCF数据契约的类型）。

比如SPI中的实体类如下：

using System.Data;

namespace XXXX.XXXX.Common.CommonHelp.SPI
{
    /// <summary>
    /// 智能帮助数据实体类
    /// 对应数据库：[A_CommonHelp]
    /// </summary>
    public class CommonHelpDataEntity
    {
        /// <summary>
        /// HelpEntity 是一个指针 标明该CommonHelpDataEntity属于哪一个CommonHelpEntity
        /// </summary>
        private CommonHelpEntity entity;
        public CommonHelpEntity HelpEntity
        {
            get { return entity; }
        }

        private string displayColumns;
        /// <summary>
        /// 显示字段
        /// </summary>
        public string DisplayColumns
        {
            get { return displayColumns; }
            set { displayColumns = value; }
        }


        private string sourceObject;
        /// <summary>
        /// 源SQL语句
        /// </summary>
        public string SourceObject
        {
            get { return sourceObject; }
            set { sourceObject = value; }
        }

        private string dataTextField;
        /// <summary>
        /// 绑定Text字段
        /// </summary>
        public string DataTextField
        {
            get { return dataTextField; }
            set { dataTextField = value; }
        }

        private string dataValueField;
        /// <summary>
        /// 绑定Value字段
        /// </summary>
        public string DataValueField
        {
            get { return dataValueField; }
            set { dataValueField = value; }
        }

        private string orderFields;

        /// <summary>
        /// 默认排序字段
        /// </summary>
        public string OrderFields
        {
            get { return orderFields; }
            set { orderFields = value; }
        }
        public string rowId;
        /// <summary>
        /// 标志字段
        /// </summary>
        public string RowId
        {
            get { return rowId; }
            set { rowId = value; }
        }

        private string defaultValueCondition;
        /// <summary>
        /// 默认值条件
        /// </summary>
        public string DefaultValueCondition
        {
            get { return defaultValueCondition; }
            set { defaultValueCondition = value; }
        }

        private string category;
        /// <summary>
        /// 帮助类别
        /// </summary>
        public string Category
        {
            get { return category; }
            set { category = value; }
        }

        private string selectDataObjectId;
        /// <summary>
        /// 搜索引擎类型帮助勾选的数据对象的Id
        /// </summary>
        public string SelectDataObjectId
        {
            get { return selectDataObjectId; }
            set { selectDataObjectId = value; }
        }

        private string searchEngineId;
        /// <summary>
        /// 搜索引擎帮助A_SearchEngine ID
        /// </summary>
        public string SearchEngineId
        {
            get { return searchEngineId; }
            set { searchEngineId = value; }
        }

        private string dataModeldId;
        /// <summary>
        /// 数据模型Id
        /// </summary>
        public string DataModeldId
        {
            get { return dataModeldId; }
            set { dataModeldId = value; }
        }

        private string createTime;
        /// <summary>
        /// 帮助创建时间
        /// </summary>
        public string CreateTime
        {
            get { return createTime; }
            set { createTime = value; }
        }
        private string lastUpdateTime;
        /// <summary>
        /// 帮助 最后更新时间
        /// </summary>
        public string LastUpdateTime
        {
            get { return lastUpdateTime; }
            set { lastUpdateTime = value; }
        }

        public CommonHelpDataEntity()
        {
            entity = new CommonHelpEntity();
            entity.SetDataEntity(this);
        }
        public CommonHelpDataEntity(CommonHelpEntity info)
        {
            entity = info;
            entity.SetDataEntity(this);
        }
        public CommonHelpDataEntity(DataRow row)
        {
            entity=new CommonHelpEntity();
            entity.Id = row["Id"].ToString();
            entity.Code = row["Code"].ToString();
            entity.Name = row["Name"].ToString();
            entity.Contains = row["DisplayColumns"].ToString();
            entity.SetDataEntity(this);

            this.DisplayColumns = row["DisplayColumns"].ToString();
            this.SourceObject = row["SourceObject"].ToString();
            this.DataTextField = row["DataTextField"].ToString();
            this.DataValueField = row["DataValueField"].ToString();
            this.OrderFields = row["OrderFields"].ToString();
            this.RowId = row["Id"].ToString();
            //int value=(row["Category"].ToString().Trim().Length==0)?0:int.Parse(row["Category"].ToString());
            //this.Category = Enum.GetName(typeof(HelpTypeEnum), value);
            this.Category = row["Category"].ToString();
            this.SearchEngineId = row["SearchEngineId"].ToString();
            this.SelectDataObjectId = row["SelectDataObjectId"].ToString();
            this.DefaultValueCondition = row["DefaultValueCondition"].ToString();
            this.CreateTime = row["CreateTime"].ToString();
            this.lastUpdateTime = row["lastUpdateTime"].ToString();
            this.dataModeldId = row["DataModeldId"].ToString();
           
        }
        /// <summary>
        /// 关联数据实体
        /// </summary>
        /// <param name="entity"></param>
        public void AssociateHelpEntity(CommonHelpEntity entity)
        {
            entity.SetDataEntity(this);
            this.entity = entity;
        }
    }
}

标识序列化之后的类的为：

 [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Runtime.Serialization", "4.0.0.0")]
    [System.Runtime.Serialization.DataContractAttribute(Name="CommonHelpDataEntity", Namespace="http://schemas.datacontract.org/2004/07/XXXX.XXXX.Common.CommonHelp.SPI")]
    [System.SerializableAttribute()]
    public partial class CommonHelpDataEntity : object, System.Runtime.Serialization.IExtensibleDataObject, System.ComponentModel.INotifyPropertyChanged {
        
        [System.NonSerializedAttribute()]
        private System.Runtime.Serialization.ExtensionDataObject extensionDataField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string CategoryField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string CreateTimeField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string DataTextFieldField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string DataValueFieldField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string DefaultValueConditionField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string DisplayColumnsField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string LastUpdateTimeField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string OrderFieldsField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string RowIdField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string SearchEngineIdField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string SelectDataObjectIdField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string SourceObjectField;
        
        [System.Runtime.Serialization.OptionalFieldAttribute()]
        private string rowId1Field;
        
        [global::System.ComponentModel.BrowsableAttribute(false)]
        public System.Runtime.Serialization.ExtensionDataObject ExtensionData {
            get {
                return this.extensionDataField;
            }
            set {
                this.extensionDataField = value;
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string Category {
            get {
                return this.CategoryField;
            }
            set {
                if ((object.ReferenceEquals(this.CategoryField, value) != true)) {
                    this.CategoryField = value;
                    this.RaisePropertyChanged("Category");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string CreateTime {
            get {
                return this.CreateTimeField;
            }
            set {
                if ((object.ReferenceEquals(this.CreateTimeField, value) != true)) {
                    this.CreateTimeField = value;
                    this.RaisePropertyChanged("CreateTime");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string DataTextField {
            get {
                return this.DataTextFieldField;
            }
            set {
                if ((object.ReferenceEquals(this.DataTextFieldField, value) != true)) {
                    this.DataTextFieldField = value;
                    this.RaisePropertyChanged("DataTextField");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string DataValueField {
            get {
                return this.DataValueFieldField;
            }
            set {
                if ((object.ReferenceEquals(this.DataValueFieldField, value) != true)) {
                    this.DataValueFieldField = value;
                    this.RaisePropertyChanged("DataValueField");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string DefaultValueCondition {
            get {
                return this.DefaultValueConditionField;
            }
            set {
                if ((object.ReferenceEquals(this.DefaultValueConditionField, value) != true)) {
                    this.DefaultValueConditionField = value;
                    this.RaisePropertyChanged("DefaultValueCondition");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string DisplayColumns {
            get {
                return this.DisplayColumnsField;
            }
            set {
                if ((object.ReferenceEquals(this.DisplayColumnsField, value) != true)) {
                    this.DisplayColumnsField = value;
                    this.RaisePropertyChanged("DisplayColumns");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string LastUpdateTime {
            get {
                return this.LastUpdateTimeField;
            }
            set {
                if ((object.ReferenceEquals(this.LastUpdateTimeField, value) != true)) {
                    this.LastUpdateTimeField = value;
                    this.RaisePropertyChanged("LastUpdateTime");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string OrderFields {
            get {
                return this.OrderFieldsField;
            }
            set {
                if ((object.ReferenceEquals(this.OrderFieldsField, value) != true)) {
                    this.OrderFieldsField = value;
                    this.RaisePropertyChanged("OrderFields");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string RowId {
            get {
                return this.RowIdField;
            }
            set {
                if ((object.ReferenceEquals(this.RowIdField, value) != true)) {
                    this.RowIdField = value;
                    this.RaisePropertyChanged("RowId");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string SearchEngineId {
            get {
                return this.SearchEngineIdField;
            }
            set {
                if ((object.ReferenceEquals(this.SearchEngineIdField, value) != true)) {
                    this.SearchEngineIdField = value;
                    this.RaisePropertyChanged("SearchEngineId");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string SelectDataObjectId {
            get {
                return this.SelectDataObjectIdField;
            }
            set {
                if ((object.ReferenceEquals(this.SelectDataObjectIdField, value) != true)) {
                    this.SelectDataObjectIdField = value;
                    this.RaisePropertyChanged("SelectDataObjectId");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute()]
        public string SourceObject {
            get {
                return this.SourceObjectField;
            }
            set {
                if ((object.ReferenceEquals(this.SourceObjectField, value) != true)) {
                    this.SourceObjectField = value;
                    this.RaisePropertyChanged("SourceObject");
                }
            }
        }
        
        [System.Runtime.Serialization.DataMemberAttribute(Name="rowId")]
        public string rowId1 {
            get {
                return this.rowId1Field;
            }
            set {
                if ((object.ReferenceEquals(this.rowId1Field, value) != true)) {
                    this.rowId1Field = value;
                    this.RaisePropertyChanged("rowId1");
                }
            }
        }
        
        public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;
        
        protected void RaisePropertyChanged(string propertyName) {
            System.ComponentModel.PropertyChangedEventHandler propertyChanged = this.PropertyChanged;
            if ((propertyChanged != null)) {
                propertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
            }
        }
    }

该标识序列化之后的类在是Reference.cs文件中找到的。

此处的详细分析，可以参考：点击打开链接

解决方案：

将Reference.cs文件所有标识序列化的类、枚举，全部删除，改为引用SPI中的实体类、枚举，然后，重新生成WCFClient，部署，问题搞定。
今天的收获：

1、断点没有进入函数（HelpDisplayEditorForm_Load），并不表示问题，一定在函数之外。

2、数据契约中KnownTypeAttribute属性，在同一个类上标识很多次，如下图：