在运行时动态创建和设置类的成员/属性

Question

如何在运行时动态创建和设置类的成员/属性.

参考:http://msdn.microsoft.com/en-us/library/system.dynamic.dynamicobject.trygetmember( v= vs.110).aspx

我试图修改这个想法以满足我的要求,但无法做到.

我需要在运行时设置类成员,意味着我将获取Key并Value从数据库和我的课将与运行前定义没有成员完全动态的,但在运行时个个是从数据库中提取.

所以这里是我的代码(取自MSDN):

public class DynamicObjDictionary : DynamicObject
{
    // The inner dictionary.
    Dictionary<string, object> dictionary = new Dictionary<string, object>();
    public int Count
    {
        get{return dictionary.Count;}
    }

public override bool TryGetMember(GetMemberBinder binder, out object result)
    {
        string name = binder.Name.ToLower();
        return dynDict.TryGetValue(name, out result);
    }

    public override bool TrySetMember(SetMemberBinder binder, object value)
    {
        dynDict[binder.Name.ToLower()] = value;
        return true;
    }
 }
}

初始化和定义类的成员/属性的代码

dynamic DynObj = new DynamicObjDictionary();
        DataSet ds = new DataSet();
        ds = GetObjectProperties() // returns dataset having the properties as key and value pair;
        if (ds.Tables["PropTable"].Rows.Count > 0)
        {
            foreach (DataRow dr in ds.Tables["PropTable"].Rows)
            {
                string KeyName = dr["KeyName"].ToString();
                string ValueName= dr["ValueName"].ToString();
                //---I want that in place of fldName the actual value from dr is added to the class - currently it returns DynObj.KeyName only.
                DynObj.KeyName = ValueName;
                // Means if current dr["KeyName"].ToString() has "Property1"
                // And dr["ValueName"].ToString() has "PropertyValue"
                // The DynObj should be like DynObj.Property1 = "PropertyValue" 
            }
        }

另一个问题是我希望在上面的初始化之后设置所有属性,以便我可以像硬编码的类对象一样访问它们.当前代码仅零售最后一个属性,即数据集的最后一行的值.

Answer 1

添加基于字典的API,或使用已有它的实现.坦率地说ExpandoObject会很好,并且IDictionary<string,object>内置了一个API.

var obj = new ExpandoObject();
DataSet ds = GetObjectProperties() // returns dataset having the properties as key and value pair;
if (ds.Tables["PropTable"].Rows.Count > 0)
{
    foreach (DataRow dr in ds.Tables["PropTable"].Rows)
    {
        string KeyName = dr["KeyName"].ToString();
        string ValueName= dr["ValueName"].ToString();
        obj[KeyName] = ValueName;
    }
}
dynamic DynObj = obj;
// ...