IEnumerableExtensions.cs
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using NCC.Dependency;
using NCC.LinqBuilder;
using System.Collections.Generic;
using System.Linq.Expressions;
namespace System.Linq
{
/// <summary>
/// IEnumerable 拓展
/// </summary>
[SuppressSniffer]
public static class IEnumerableExtensions
{
/// <summary>
/// 根据条件成立再构建 Where 查询
/// </summary>
/// <typeparam name="TSource">泛型类型</typeparam>
/// <param name="sources">集合对象</param>
/// <param name="condition">布尔条件</param>
/// <param name="expression">表达式</param>
/// <returns>新的集合对象</returns>
public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> sources, bool condition, Expression<Func<TSource, bool>> expression)
{
return condition ? Queryable.Where(sources, expression) : sources;
}
/// <summary>
/// 根据条件成立再构建 Where 查询，支持索引器
/// </summary>
/// <typeparam name="TSource">泛型类型</typeparam>
/// <param name="sources">集合对象</param>
/// <param name="condition">布尔条件</param>
/// <param name="expression">表达式</param>
/// <returns>新的集合对象</returns>
public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> sources, bool condition, Expression<Func<TSource, int, bool>> expression)
{
return condition ? Queryable.Where(sources, expression) : sources;
}
/// <summary>
/// 与操作合并多个表达式
/// </summary>
/// <typeparam name="TSource">泛型类型</typeparam>
/// <param name="sources">集合对象</param>
/// <param name="expressions">表达式数组</param>
/// <returns>新的集合对象</returns>
public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> sources, params Expression<Func<TSource, bool>>[] expressions)
{
if (expressions == null || !expressions.Any()) return sources;
if (expressions.Length == 1) return Queryable.Where(sources, expressions[0]);
var expression = LinqExpression.Or<TSource>();
foreach (var _expression in expressions)
{
expression = expression.Or(_expression);
}
return Queryable.Where(sources, expression);
}
/// <summary>
/// 与操作合并多个表达式，支持索引器
/// </summary>
/// <typeparam name="TSource">泛型类型</typeparam>
/// <param name="sources">集合对象</param>
/// <param name="expressions">表达式数组</param>
/// <returns>新的集合对象</returns>
public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> sources, params Expression<Func<TSource, int, bool>>[] expressions)
{
if (expressions == null || !expressions.Any()) return sources;
if (expressions.Length == 1) return Queryable.Where(sources, expressions[0]);
var expression = LinqExpression.IndexOr<TSource>();
foreach (var _expression in expressions)
{
expression = expression.Or(_expression);
}
return Queryable.Where(sources, expression);
}
/// <summary>
/// 根据条件成立再构建 WhereOr 查询
/// </summary>
/// <typeparam name="TSource">泛型类型</typeparam>
/// <param name="sources">集合对象</param>
/// <param name="conditionExpressions">条件表达式</param>
/// <returns>新的集合对象</returns>
public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> sources, params (bool condition, Expression<Func<TSource, bool>> expression)[] conditionExpressions)
{
var expressions = new List<Expression<Func<TSource, bool>>>();
foreach (var (condition, expression) in conditionExpressions)
{
if (condition) expressions.Add(expression);
}
return Where(sources, expressions.ToArray());
}
/// <summary>
/// 根据条件成立再构建 WhereOr 查询，支持索引器
/// </summary>
/// <typeparam name="TSource">泛型类型</typeparam>
/// <param name="sources">集合对象</param>
/// <param name="conditionExpressions">条件表达式</param>
/// <returns>新的集合对象</returns>
public static IQueryable<TSource> Where<TSource>(this IQueryable<TSource> sources, params (bool condition, Expression<Func<TSource, int, bool>> expression)[] conditionExpressions)
{
var expressions = new List<Expression<Func<TSource, int, bool>>>();
foreach (var (condition, expression) in conditionExpressions)
{
if (condition) expressions.Add(expression);
}
return Where(sources, expressions.ToArray());
}
/// <summary>
/// 根据条件成立再构建 Where 查询
/// </summary>
/// <typeparam name="TSource">泛型类型</typeparam>
/// <param name="sources">集合对象</param>
/// <param name="condition">布尔条件</param>
/// <param name="expression">表达式</param>
/// <returns>新的集合对象</returns>
public static IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> sources, bool condition, Func<TSource, bool> expression)
{
return condition ? sources.Where(expression) : sources;
}
/// <summary>
/// 根据条件成立再构建 Where 查询，支持索引器
/// </summary>
/// <typeparam name="TSource">泛型类型</typeparam>
/// <param name="sources">集合对象</param>
/// <param name="condition">布尔条件</param>
/// <param name="expression">表达式</param>
/// <returns>新的集合对象</returns>
public static IEnumerable<TSource> Where<TSource>(this IEnumerable<TSource> sources, bool condition, Func<TSource, int, bool> expression)
{
return condition ? sources.Where(expression) : sources;
}
}
}