Datatable轉換成List實體對象列表 幾個實例

一，

    /// <summary>  
    /// 將Datatable轉換為List集合  
    /// </summary>  
    /// <typeparam name="T">類型參數</typeparam>  
    /// <param name="dt">datatable表</param>  
    /// <returns></returns>  
    public static List<T> DataTableToList<T>(DataTable dt)  
    {  
        var list = new List<T>();  
        Type t = typeof(T);  
        var plist = new List<PropertyInfo>(typeof(T).GetProperties());  
      
        foreach (DataRow item in dt.Rows)  
        {  
            T s = System.Activator.CreateInstance<T>();  
            for (int i = 0; i < dt.Columns.Count; i++)  
            {  
                PropertyInfo info = plist.Find(p => p.Name == dt.Columns[i].ColumnName);  
                if (info != null)  
                {  
                    if (!Convert.IsDBNull(item[i]))  
                    {  
                        info.SetValue(s, item[i], null);  
                    }  
                }  
            }  
            list.Add(s);  
        }  
        return list;  
    }  

 

二，

public static IList<T> convertToList<T>(DataTable dt) where T : new()
 8         {
 9             // 定義集合 
10             List<T> ts = new List<T>();
11 
12             // 獲得此模型的類型 
13             Type type = typeof(T);
14             //定義一個臨時變量 
15             string tempName = string.Empty;
16             //遍歷DataTable中所有的數據行  
17             foreach (DataRow dr in dt.Rows)
18             {
19                 T t = new T();
20                 // 獲得此模型的公共屬性 
21                 PropertyInfo[] propertys = t.GetType().GetProperties();
22                 //遍歷該對象的所有屬性 
23                 foreach (PropertyInfo pi in propertys)
24                 {
25                     tempName = pi.Name;//將屬性名稱賦值給臨時變量   
26                     //檢查DataTable是否包含此列（列名==對象的屬性名）     
27                     if (dt.Columns.Contains(tempName))
28                     {
29                         // 判斷此屬性是否有Setter   
30                         if (!pi.CanWrite) continue;//該屬性不可寫，直接跳出   
31                         //取值   
32                         object value = dr[tempName];
33                         //如果非空，則賦給對象的屬性   
34                         if (value != DBNull.Value)
35                             pi.SetValue(t, value, null);
36                     }
37                 }
38                 //對象添加到泛型集合中 
39                 ts.Add(t);
40             }
41             return ts;
42         }

三，

1.DataTable到List<T>的轉換

          public static List<T> DataTableToT<T>(DataTable source) where T : class, new()
          {
            List<T> itemlist = null;
            if (source == null || source.Rows.Count == 0)
            {
                return itemlist;
            }
            itemlist = new List<T>();
            T item = null;
            Type targettype = typeof(T);
            Type ptype = null;
            Object value = null;
            foreach (DataRow dr in source.Rows)
            {
                item = new T();
                foreach (PropertyInfo pi in targettype.GetProperties())
                {
                    if (pi.CanWrite && source.Columns.Contains(pi.Name))
                    {
                        ptype = Type.GetType(pi.PropertyType.FullName);
                        value = Convert.ChangeType(dr[pi.Name], ptype);
                        pi.SetValue(item, value, null);
                    }
                }
                itemlist.Add(item);
            }

            return itemlist;
         }
    2.DataRow到T的轉換

       public static T DataRowToT<T>(DataRow source) where T:class,new()
        {
            T item = null;
            if (source == null)
            {
                return item;
            }
            item = new T();
            Type targettype = typeof(T);
            Type ptype = null;
            Object value = null;
           
            foreach (PropertyInfo pi in targettype.GetProperties())
            {
                if (pi.CanWrite && source.Table.Columns.Contains(pi.Name))
                {
                    ptype = Type.GetType(pi.PropertyType.FullName);
                    value = Convert.ChangeType(source[pi.Name], ptype);
                    pi.SetValue(item, value, null);
                }
            }
            return item;
        }