/// <summary>
/// 将源数据对象转换到新对象中
/// </summary>
/// <typeparam name="TSource">原数据实体类型</typeparam>
/// <typeparam name="TResult">返回值的新实体类型</typeparam>
/// <param name="queryable">查询对象</param>
/// <param name="expression">给新实体赋值的表达式</param>
/// <returns>Queryable</returns>
public static Queryable <TResult> Select <TSource, TResult>(this Queryable <TSource> queryable,
Expression <Func <TSource, TResult> > expression)
{
var type = typeof(TSource);
var expStr = expression.ToString();
var reval = new Queryable <TResult>
{
DB = queryable.DB,
OrderByValue = queryable.OrderByValue,
Params = queryable.Params,
Skip = queryable.Skip,
Take = queryable.Take,
WhereValue = queryable.WhereValue,
TableName = queryable.TableName,
GroupByValue = queryable.GroupByValue,
JoinTableValue = queryable.JoinTableValue
};
if (queryable.JoinTableValue.IsValuable())
{
ResolveSelect.GetResult(expStr, reval, expression);
}
else
{
reval.SelectValue = expStr;
ResolveSelect.GetResult(reval, expression);
}
return(reval);
}
/// <summary>
/// 将源数据对象转换到新对象中
/// </summary>
/// <typeparam name="T">原数据实体类型</typeparam>
/// <typeparam name="T2">原数据实体类型</typeparam>
/// <typeparam name="T3">原数据实体类型</typeparam>
/// <typeparam name="T4">原数据实体类型</typeparam>
/// <typeparam name="T5">原数据实体类型</typeparam>
/// <typeparam name="TResult">返回值的新实体类型</typeparam>
/// <param name="queryable">查询对象</param>
/// <param name="expression">给新实体赋值的表达式</param>
/// <returns>Queryable</returns>
public static Queryable <TResult> Select <T, T2, T3, T4, T5, TResult>(this Queryable <T> queryable,
Expression <Func <T, T2, T3, T4, T5, TResult> > expression)
{
var expStr = expression.ToString();
var type = typeof(T);
var reval = new Queryable <TResult>
{
DB = queryable.DB,
OrderByValue = queryable.OrderByValue,
Params = queryable.Params,
Skip = queryable.Skip,
Take = queryable.Take,
WhereValue = queryable.WhereValue,
TableName = queryable.TableName,
GroupByValue = queryable.GroupByValue,
JoinTableValue = queryable.JoinTableValue
};
ResolveSelect.GetResult(expStr, reval, expression);
return(reval);
}
