在 ASP.Net 中复制字典对象答案

【问题标题】：Copy a dictionary object in ASP.Net在 ASP.Net 中复制字典对象
【发布时间】：2011-07-11 23:04:32
【问题描述】：

我的可序列化类在下面，我正在尝试让它正确复制。

    public class AppContext : IXmlSerializable 
    {
        public bool autoGeneratedTitle = true;
        public bool truncateLabels = false;

        public IDictionary<string, OPTIONS> dict_Options = new Dictionary<string, OPTIONS>();
        // Advanced Options
        public List<string> listAdvancedOptions = new List<string>();

        public IDictionary<string, string> dictFilterPermissions = new Dictionary<string, string>();




        public class OPTIONS {
            public string subjectId = string.Empty;
            public string varNumber = string.Empty;
            public string varName = string.Empty;
            public string format = string.Empty;
            public string varLabel = string.Empty;

            public IDictionary<string, string> dictTagElements = new Dictionary<string, string>();
            public IDictionary<string, string> dictRefElements = new Dictionary<string, string>();
            ////TJM add includeZero
            public string includeZero = string.Empty;
        }


        public void CopyContext(AppContext copy)
        {

            autoGeneratedTitle = copy.autoGeneratedTitle;
            truncateLabels = copy.truncateLabels;

            dict_Options = ?;
            dictFilterPermissions = ?;
            listAdvancedOptions = ?;
        }
    }

如何正确复制 dict_Options、dictFilterPermissions 和 listAdvancedOptions？

【问题讨论】：

我有过这个，对你有用吗？公共静态对象 DeepClone(object source) { MemoryStream m = new MemoryStream(); BinaryFormatter b = new BinaryFormatter(); b.序列化（m，源）； m.位置 = 0;返回 b.Deserialize(m); }

标签： c# asp.net dictionary copy

【解决方案1】：

我不确定这是否是你想要的，但也许你想克隆一个字典/列表。如果您需要的是克隆字典而不是其中的对象，因此您只能获得引用的副本，那么您可以使用字典的默认构造函数。请参阅问题以获得进一步解释：What is the best way to clone/deep copy a .NET generic Dictionary<string, T>?

如果您需要深度克隆（注意这是一项繁重的操作），您必须自己实现它，但这并不难：通过 Dictionary 类继承，实现 ICloneable 并使用 where 子句确保类型用作键/值也实现 ICloneable。

阅读该问题中给出的解释这部分的答案

【讨论】：

【解决方案2】：

从 .NET 论坛的链接中在线找到此内容。

    public virtual AppContext DeepClone()
    {
        //First do a shallow copy.
        AppContext returnData = (AppContext)this.MemberwiseClone();

        //Get the type.
        Type type = returnData.GetType();

        //Now get all the member variables.
        FieldInfo[] fieldInfoArray = type.GetFields();

        //Deepclone members that extend AppContext.
        //This will ensure we get everything we need.
        foreach (FieldInfo fieldInfo in fieldInfoArray)
        {
            //This gets the actual object in that field.
            object sourceFieldValue = fieldInfo.GetValue(this);

            //See if this member is AppContext
            if (sourceFieldValue is AppContext)
            {
                //If so, cast as a AppContext.
                AppContext sourceAppContext = (AppContext)sourceFieldValue;

                //Create a clone of it.
                AppContext clonedAppContext = sourceAppContext.DeepClone();

                //Within the cloned containig class.
                fieldInfo.SetValue(returnData, clonedAppContext);
            }
        }
        return returnData;
    }

这似乎可以工作并像这样使用它：

      AppContext tempContext = new AppContext();

        tempContext = appContext.DeepClone();

【讨论】：