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社区首页 >专栏 >C# DataTable 转换成List<T>

C# DataTable 转换成List<T>

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aehyok
发布2018-09-11 12:03:29
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发布2018-09-11 12:03:29
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文章被收录于专栏:技术博客
代码语言:javascript
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运用泛型和反射实现的转换,很给力。代码中掺杂详尽注释,稍微了解一下泛型和反射便可以了解转换的实质。可以直接复制粘贴进行调用哦。

public class DtConverToList<T> where T : new()
{
    public static List<T> DtToList(DataTable dt)
    {
        //定义集合
        List<T> ListCollection = new List<T>(dt.Rows.Count);
        //获得 T 模型类型
        Type T_type = typeof(T);
        //获得 T 模型类型公共属性
        PropertyInfo[] Proper = T_type.GetProperties();
        //临时变量,存储变量模型公共属性Name
        string Tempname = "";
        //遍历参数 DataTable的每行
        foreach (DataRow Dr in dt.Rows)
        {
            //实例化 T 模版类
            T t = new T();
            //遍历T 模版类各个属性
            #region
            foreach (PropertyInfo P in Proper)
            {
                //取出类属性之一
                Tempname = P.Name;
                //判断DataTable中是否有此列
                if (dt.Columns.Contains(Tempname))
                {
                    //判断属性是否可写属性
                    if (!P.CanWrite)
                    {
                        continue;
                    }
                    try
                    {
                        //得到Datable单元格中的值
                        object value = Dr[Tempname];
                        //得到 T 属性类型
                        Type ProType = P.PropertyType;
                        //判断类型赋值
                        if (value != DBNull.Value)
                        {
                            //
                            if (value.GetType() == ProType)
                            {
                                P.SetValue(t, value, null);
                            }
                            else
                            {
                                if (ProType == typeof(string))
                                {
                                    string Temp = value.ToString();
                                    P.SetValue(t, Temp, null);
                                }
                                else if (ProType == typeof(byte))
                                {
                                    byte Temp = Convert.ToByte(value);
                                    P.SetValue(t, Temp, null);
                                }
                                else if (ProType == typeof(short))
                                {
                                    short Temp = short.Parse(value.ToString());
                                    P.SetValue(t, Temp, null);
                                }
                                else if (ProType == typeof(long))
                                {
                                    long Temp = long.Parse(value.ToString());
                                    P.SetValue(t, Temp, null);
                                }
 
                                else if (ProType == typeof(Int64))
                                {
                                    Int64 Temp = Convert.ToInt64(value);
                                    P.SetValue(t, Temp, null);
                                }
                                else if (ProType == typeof(Int32))
                                {
                                    Int32 Temp = Convert.ToInt32(value);
                                    P.SetValue(t, Temp, null);
                                }
                                else if (ProType == typeof(Int16))
                                {
                                    Int16 Temp = Convert.ToInt16(value);
                                    P.SetValue(t, Temp, null);
                                }
                                else
                                {
                                    object Temp = Convert.ChangeType(value, ProType);
                                    P.SetValue(t, Temp, null);
                                }
                            }
                        }
                    }
                    catch (Exception)
                    {
 
                        throw;
                    }
                }
            }
            #endregion
            ListCollection.Add(t);
        }
        return ListCollection;
    }
}
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原始发表:2013-03-02 ,如有侵权请联系 cloudcommunity@tencent.com 删除

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