C# DataTable 和List之间相互转换的方法

介绍：List/IEnumerable转换到DataTable/DataView，以及DataTable转换到List

正文：

一、List<T>/IEnumerable转换到DataTable/DataView

方法一：

 1 /// <summary>
 2 /// Convert a List{T} to a DataTable.
 3 /// </summary>
 4 private DataTable ToDataTable<T>(List<T> items)
 5 {
 6     var tb = new DataTable(typeof (T).Name);
 7  
 8     PropertyInfo[] props = typeof (T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
 9  
10     foreach (PropertyInfo prop in props)
11     {
12         Type t = GetCoreType(prop.PropertyType);
13         tb.Columns.Add(prop.Name, t);
14     }
15  
16     foreach (T item in items)
17     {
18         var values = new object[props.Length];
19  
20         for (int i = 0; i < props.Length; i++)
21         {
22             values[i] = props[i].GetValue(item, null);
23         }
24  
25         tb.Rows.Add(values);
26     }
27  
28     return tb;
29 }
30  
31 /// <summary>
32 /// Determine of specified type is nullable
33 /// </summary>
34 public static bool IsNullable(Type t)
35 {
36     return !t.IsValueType || (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>));
37 }
38  
39 /// <summary>
40 /// Return underlying type if type is Nullable otherwise return the type
41 /// </summary>
42 public static Type GetCoreType(Type t)
43 {
44     if (t != null && IsNullable(t))
45     {
46         if (!t.IsValueType)
47         {
48             return t;
49         }
50         else
51         {
52             return Nullable.GetUnderlyingType(t);
53         }
54     }
55     else
56     {
57         return t;
58     }
59 }

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