C#（99）：泛型举例：List<T>与DateTable相互转换

一、 DataTable转换到List<T>

/// <summary>   
/// TableToList   
/// </summary> 
public class TableListConverter<T> where T : class, new()
{
    public static IList<T> TableToList(DataTable dt)
    {

        IList<T> ts = new List<T>();// 定义集合
        Type type = typeof(T);// 获得此模型的类型
        string tempName = "";
        foreach (DataRow dr in dt.Rows)
        {
            T t = new T();
            // 获得此模型的公共属性
            PropertyInfo[] propertys = t.GetType().GetProperties();
            foreach (PropertyInfo pi in propertys)
            {
                tempName = pi.Name;
                if (dt.Columns.Contains(tempName))// 检查DataTable是否包含此列
                {
                    if (!pi.CanWrite) continue;// 判断此属性是否有Setter

                    object value = dr[tempName];
                    if (value != DBNull.Value)
                        pi.SetValue(t, value, null);
                }
            }
            ts.Add(t);
        }

        return ts;

    }
}

应用：

// 获得查询结果 
DataTable dt = DbHelper.ExecuteDataTable("...");
// 把DataTable转换为IList<UserInfo> 
IList<UserInfo> users = TableListConverter<UserInfo>.TableToList(dt);

二、 List<T>转换到DataTable

/// <summary>   
/// ListToTable   
/// </summary>   
public class TableListConverter
{
    public static DataTable ListToTable<T>(IList<T> list) where T : class, new()
    {
        if (list == null) return null;
        Type type = typeof(T);
        DataTable dt = new DataTable();

        PropertyInfo[] properties = Array.FindAll(type.GetProperties(), p => p.CanRead);//判断此属性是否有Getter
        Array.ForEach(properties, prop => { dt.Columns.Add(prop.Name, prop.PropertyType); });//添加到列
        foreach (T t in list)
        {
            DataRow row = dt.NewRow();
            Array.ForEach(properties, prop =>
            {
                row[prop.Name] = prop.GetValue(t, null);
            });//添加到行
            dt.Rows.Add(row);
        }
        return dt;
    }
}

应用：

//IList<UserInfo> users 
DataTable dt =TableListConverter.ListToTable(users)