DataTables List互相转换的实现类示例

复制代码 代码如下:

public static class DataTableHelper
    {
        public static DataTable ConvertTo(IList list)
        {
            DataTable table = CreateTable();
            Type entityType = typeof(T);
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entityType);
            foreach (T item in list)
            {
                DataRow row = table.NewRow();
                foreach (PropertyDescriptor prop in properties)
                    row[prop.Name] = prop.GetValue(item);
                table.Rows.Add(row);
            }
            return table;
        }

        public static IList ConvertTo(IList rows)
        {
            IList list = null;
            if (rows != null)
            {
                list = new List();
                foreach (DataRow row in rows)
                {
                    T item = CreateItem(row);
                    list.Add(item);
                }
            }
            return list;
        }

        public static IList ConvertTo(DataTable table)
        {
            if (table == null)
                return null;

            List rows = new List();
            foreach (DataRow row in table.Rows)
                rows.Add(row);

            return ConvertTo(rows);
        }

        //Convert DataRow into T Object
        public static T CreateItem(DataRow row)
        {
            string columnName;
            T obj = default(T);
            if (row != null)
            {
                obj = Activator.CreateInstance();
                foreach (DataColumn column in row.Table.Columns)
                {
                    columnName = column.ColumnName;
                    //Get property with same columnName
                    PropertyInfo prop = obj.GetType().GetProperty(columnName);
                    try
                    {
                        //Get value for the column
                        object value = (row[columnName].GetType() == typeof(DBNull))
                        ? null : row[columnName];
                        //Set property value
                        if (prop.CanWrite)    //判断其是否可写
                            prop.SetValue(obj, value, null);
                    }
                    catch
                    {
                        throw;
                        //Catch whatever here
                    }
                }
            }
            return obj;
        }

        public static DataTable CreateTable()
        {
            Type entityType = typeof(T);
            DataTable table = new DataTable(entityType.Name);
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(entityType);

            foreach (PropertyDescriptor prop in properties)
                table.Columns.Add(prop.Name, prop.PropertyType);

            return table;
        }
    }