/// <summary>
/// 返回特定类型的对象的集合，其中类型由 T 参数定义
/// </summary>
public IDbQueryable <T> GetTable <T>()
{
DbQueryable <T> query = new DbQueryable <T>(this, new List <DbExpression> {
new DbExpression(DbExpressionType.GetTable, Expression.Constant(typeof(T)))
});
return(query);
}
/// <summary>
/// 返回特定类型的对象的集合，其中类型由 T 参数定义
/// <para>
/// 适用场景：
/// 多个导航属性类型一致，用此重载可解决 a.Navigation.Property 的表别名定位问题
/// </para>
/// </summary>
/// <typeparam name="T">元素类型</typeparam>
/// <typeparam name="TProperty">导航属性类型</typeparam>
/// <param name="path">导航属性，注意在一组上下文中第一个 GetTable 的这个参数将被自动忽略</param>
/// <returns></returns>
public IDbQueryable <TProperty> GetTable <T, TProperty>(Expression <Func <T, TProperty> > path)
{
DbQueryable <TProperty> query = new DbQueryable <TProperty>(this, new List <DbExpression>
{
new DbExpression(DbExpressionType.GetTable, new[] { Expression.Constant(typeof(TProperty)), (Expression)path }),
});
return(query);
}
/// <summary>
/// 创建查询
/// </summary>
public IDbQueryable <TResult> CreateQuery <TResult>(DbExpression dbExpression = null)
{
List <DbExpression> collection = new List <DbExpression>(this.DbExpressions.Count + (dbExpression != null ? 1 : 0));
collection.AddRange(this.DbExpressions);
if (dbExpression != null)
{
collection.Add(dbExpression);
}
IDbQueryable <TResult> query = new DbQueryable <TResult>(this.DbContext, collection);
return(query);
}