List <T> to DataView

Question

如何将List转换为.Net中的数据视图。

Answer 1

我的建议是将列表转换为DataTable，然后使用该表的默认视图来构建DataView。

首先，你必须建立数据表：

// <T> is the type of data in the list. 
// If you have a List<int>, for example, then call this as follows: 
// List<int> ListOfInt; 
// DataTable ListTable = BuildDataTable<int>(ListOfInt); 
public static DataTable BuildDataTable<T>(IList<T> lst) 
{ 
    //create DataTable Structure 
    DataTable tbl = CreateTable<T>(); 
    Type entType = typeof(T); 
    PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entType); 
    //get the list item and add into the list 
    foreach (T item in lst) 
    { 
    DataRow row = tbl.NewRow(); 
    foreach (PropertyDescriptor prop in properties) 
    { 
     row[prop.Name] = prop.GetValue(item); 
    } 
    tbl.Rows.Add(row); 
    } 
    return tbl; 
} 

private static DataTable CreateTable<T>() 
{ 
    //T –> ClassName 
    Type entType = typeof(T); 
    //set the datatable name as class name 
    DataTable tbl = new DataTable(entType.Name); 
    //get the property list 
    PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entType); 
    foreach (PropertyDescriptor prop in properties) 
    { 
    //add property as column 
    tbl.Columns.Add(prop.Name, prop.PropertyType); 
    } 
    return tbl; 
} 

接下来，让DataTable的默认视图：

DataView NewView = MyDataTable.DefaultView; 

一个完整的例子如下：

List<int> ListOfInt = new List<int>(); 
// populate list 
DataTable ListAsDataTable = BuildDataTable<int>(ListOfInt); 
DataView ListAsDataView = ListAsDataTable.DefaultView;