好的，.NET 2.0的答案是:

如果不需要克隆值，可以使用构造函数重载to Dictionary，该构造函数接受一个现有的Dictionary。(也可以将比较器指定为现有字典的比较器。)

如果你确实需要克隆值，你可以使用这样的方法:

public static Dictionary<TKey, TValue> CloneDictionaryCloningValues<TKey, TValue>
   (Dictionary<TKey, TValue> original) where TValue : ICloneable
{
    Dictionary<TKey, TValue> ret = new Dictionary<TKey, TValue>(original.Count,
                                                            original.Comparer);
    foreach (KeyValuePair<TKey, TValue> entry in original)
    {
        ret.Add(entry.Key, (TValue) entry.Value.Clone());
    }
    return ret;
}

当然，这也依赖于TValue.Clone()是一个适当的深度克隆。

(注意:虽然克隆版本可能很有用，但对于简单的浅复制，我在另一篇文章中提到的构造函数是更好的选择。)

你希望拷贝的深度是多少，你使用的是什么版本的。net ?如果你使用的是。net 3.5，我认为对ToDictionary的LINQ调用，同时指定键和元素选择器将是最简单的方法。

例如，如果你不介意这个值是一个浅克隆:

var newDictionary = oldDictionary.ToDictionary(entry => entry.Key,
                                               entry => entry.Value);

如果你已经限制了T来实现ICloneable:

var newDictionary = oldDictionary.ToDictionary(entry => entry.Key, 
                                               entry => (T) entry.Value.Clone());

(这些方法未经测试，但应该有效。)

在这种情况下，你有一个"object"的字典，object可以是(double, int，…或ComplexClass):

Dictionary<string, object> dictSrc { get; set; }

public class ComplexClass : ICloneable
{
    
    private Point3D ...;
    private Vector3D ....;
    [...]

    public object Clone()
    {
        ComplexClass clone = new ComplexClass();
        clone = (ComplexClass)this.MemberwiseClone();
        return clone;
    }

}


dictSrc["toto"] = new ComplexClass()
dictSrc["tata"] = 12.3
...

dictDest = dictSrc.ToDictionary(entry => entry.Key,
                                entry => ((entry.Value is ICloneable) ? (entry.Value as ICloneable).Clone() : entry.Value) );

这里是一些真正的“真正的深度复制”，不知道类型用一些递归行走，很适合初学者。我认为它适用于嵌套类型和几乎所有棘手的类型。我还没有添加嵌套数组处理，但是您可以根据自己的选择进行修改。

Dictionary<string, Dictionary<string, dynamic>> buildInfoDict =
    new Dictionary<string, Dictionary<string, dynamic>>()
    {
        {"tag",new Dictionary<string,dynamic>(){
                 { "attrName", "tag"  },
                 { "isCss", "False"  },
               { "turnedOn","True" },
                 { "tag",null }
            } },
        {"id",new Dictionary<string,dynamic>(){
                 { "attrName", "id"  },
                 { "isCss", "False"  },
               { "turnedOn","True" },
                 { "id",null }
            } },
                {"width",new Dictionary<string,dynamic>(){
                 { "attrName", "width"  },
                 { "isCss", "True"  },
               { "turnedOn","True" },
                 { "width","20%" }
            } },
                {"height",new Dictionary<string,dynamic>(){
                 { "attrName", "height"  },
                 { "isCss", "True"  },
               { "turnedOn","True" },
                 { "height","20%" }
            } },
                {"text",new Dictionary<string,dynamic>(){
                 { "attrName", null  },
                 { "isCss", "False"  },
               { "turnedOn","True" },
                 { "text","" }
            } },
                {"href",new Dictionary<string,dynamic>(){
                 { "attrName", null  },
                 { "isCss", "False"  },
                 { "flags", "removeAttrIfTurnedOff"  },
               { "turnedOn","True" },
                 { "href","about:blank" }
            } }
    };

var cln=clone(buildInfoDict);

public static dynamic clone(dynamic obj)
{
    dynamic cloneObj = null;
    if (IsAssignableFrom(obj, typeof(IDictionary)))
    {
        cloneObj = Activator.CreateInstance(obj.GetType());
        foreach (var key in obj.Keys)
        {
            cloneObj[key] = clone(obj[key]);
        }

    }
    else if (IsNumber(obj) || obj.GetType() == typeof(string))
    {
        cloneObj = obj;
    }
    else
    {
        Debugger.Break();
    }
    return cloneObj;
}


public static bool IsAssignableFrom(this object obj, Type ObjType = null, Type ListType = null, bool HandleBaseTypes = false)
{
    if (ObjType == null)
    {
        ObjType = obj.GetType();
    }

    bool Res;

    do
    {
        Res = (ObjType.IsGenericType && ObjType.GetGenericTypeDefinition().IsAssignableFrom(ListType)) ||
            (ListType == null && ObjType.IsAssignableFrom(obj.GetType()));
        ObjType = ObjType.BaseType;
    } while ((!Res && ObjType != null) && HandleBaseTypes && ObjType != typeof(object));

    return Res;
}

public static bool IsNumber(this object value)
{
    return value is sbyte
            || value is byte
            || value is short
            || value is ushort
            || value is int
            || value is uint
            || value is long
            || value is ulong
            || value is float
            || value is double
            || value is decimal;
}

二进制序列化方法工作得很好，但在我的测试中，它比克隆的非序列化实现慢了10倍。在Dictionary<string, List<double>>上测试

好的，.NET 2.0的答案是:

如果不需要克隆值，可以使用构造函数重载to Dictionary，该构造函数接受一个现有的Dictionary。(也可以将比较器指定为现有字典的比较器。)

如果你确实需要克隆值，你可以使用这样的方法:

public static Dictionary<TKey, TValue> CloneDictionaryCloningValues<TKey, TValue>
   (Dictionary<TKey, TValue> original) where TValue : ICloneable
{
    Dictionary<TKey, TValue> ret = new Dictionary<TKey, TValue>(original.Count,
                                                            original.Comparer);
    foreach (KeyValuePair<TKey, TValue> entry in original)
    {
        ret.Add(entry.Key, (TValue) entry.Value.Clone());
    }
    return ret;
}

当然，这也依赖于TValue.Clone()是一个适当的深度克隆。