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大师兄法号随缘
2025-09-19 17:42:11 +08:00
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电子展板/Utility/Core/LinqExtension.cs Normal file
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
namespace 电子展板.Utility.Core
{
/// <summary>
/// LINQ扩展方法
/// </summary>
public static class LinqExtension
{
/// <summary>
/// 与连接
/// </summary>
/// <typeparam name="T">类型</typeparam>
/// <param name="left">左条件</param>
/// <param name="right">右条件</param>
/// <returns>新表达式</returns>
public static Expression<Func<T, bool>> And<T>(this Expression<Func<T, bool>> left, Expression<Func<T, bool>> right)
{
return CombineLambdas(left, right, ExpressionType.AndAlso);
}
/// <summary>
/// 或连接
/// </summary>
/// <typeparam name="T">类型</typeparam>
/// <param name="left">左条件</param>
/// <param name="right">右条件</param>
/// <returns>新表达式</returns>
public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> left, Expression<Func<T, bool>> right)
{
return CombineLambdas(left, right, ExpressionType.OrElse);
}
private static Expression<Func<T, bool>> CombineLambdas<T>(this Expression<Func<T, bool>> left, Expression<Func<T, bool>> right, ExpressionType expressionType)
{
var visitor = new SubstituteParameterVisitor
{
Sub =
{
[right.Parameters[0]] = left.Parameters[0]
}
};
Expression body = Expression.MakeBinary(expressionType, left.Body, visitor.Visit(right.Body));
return Expression.Lambda<Func<T, bool>>(body, left.Parameters[0]);
}
/// <summary>
/// 取最大值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <returns></returns>
public static TResult MaxOrDefault<TSource, TResult>(this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector) => source.Select(selector).OrderByDescending(_ => _).FirstOrDefault();
/// <summary>
/// 取最大值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static TResult MaxOrDefault<TSource, TResult>(this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector, TResult defaultValue)
{
TResult result = source.Select(selector).OrderByDescending(_ => _).FirstOrDefault();
if (result != null)
return result;
return defaultValue;
}
/// <summary>
/// 取最大值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <returns></returns>
public static TSource MaxOrDefault<TSource>(this IQueryable<TSource> source)
{
return source.OrderByDescending(_ => _).FirstOrDefault();
}
/// <summary>
/// 取最大值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static TSource MaxOrDefault<TSource>(this IQueryable<TSource> source, TSource defaultValue)
{
TSource result = source.OrderByDescending(_ => _).FirstOrDefault();
if (result != null)
return result;
return defaultValue;
}
/// <summary>
/// 取最大值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static TResult MaxOrDefault<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector, TResult defaultValue)
{
TResult result = source.Select(selector).OrderByDescending(_ => _).FirstOrDefault();
if (result != null)
return result;
return defaultValue;
}
/// <summary>
/// 取最大值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <returns></returns>
public static TSource MaxOrDefault<TSource>(this IEnumerable<TSource> source) => source.OrderByDescending(_ => _).FirstOrDefault();
/// <summary>
/// 取最大值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static TSource MaxOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue)
{
TSource result = source.OrderByDescending(_ => _).FirstOrDefault();
if (result != null)
return result;
return defaultValue;
}
/// <summary>
/// 取最小值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <returns></returns>
public static TResult MinOrDefault<TSource, TResult>(this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector) => source.Select(selector).OrderBy(_ => _).FirstOrDefault();
/// <summary>
/// 取最小值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static TResult MinOrDefault<TSource, TResult>(this IQueryable<TSource> source, Expression<Func<TSource, TResult>> selector, TResult defaultValue)
{
TResult result = source.Select(selector).OrderBy(_ => _).FirstOrDefault();
if (result != null)
return result;
return defaultValue;
}
/// <summary>
/// 取最小值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <returns></returns>
public static TSource MinOrDefault<TSource>(this IQueryable<TSource> source) => source.OrderBy(_ => _).FirstOrDefault();
/// <summary>
/// 取最小值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static TSource MinOrDefault<TSource>(this IQueryable<TSource> source, TSource defaultValue)
{
TSource result = source.OrderBy(_ => _).FirstOrDefault();
if (result != null)
return result;
return defaultValue;
}
/// <summary>
/// 取最小值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <returns></returns>
public static TResult MinOrDefault<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector) => source.Select(selector).OrderBy(_ => _).FirstOrDefault();
/// <summary>
/// 取最小值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <typeparam name="TResult"></typeparam>
/// <param name="source"></param>
/// <param name="selector"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static TResult MinOrDefault<TSource, TResult>(this IEnumerable<TSource> source, Func<TSource, TResult> selector, TResult defaultValue)
{
TResult result = source.Select(selector).OrderBy(_ => _).FirstOrDefault();
if (result != null)
return result;
return defaultValue;
}
/// <summary>
/// 取最小值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <returns></returns>
public static TSource MinOrDefault<TSource>(this IEnumerable<TSource> source) => source.OrderBy(_ => _).FirstOrDefault();
/// <summary>
/// 取最小值
/// </summary>
/// <typeparam name="TSource"></typeparam>
/// <param name="source"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static TSource MinOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue)
{
TSource result = source.OrderBy(_ => _).FirstOrDefault();
if (result != null)
return result;
return defaultValue;
}
}
internal class SubstituteParameterVisitor : ExpressionVisitor
{
public Dictionary<Expression, Expression> Sub = new Dictionary<Expression, Expression>();
protected override Expression VisitParameter(ParameterExpression node)
{
return Sub.TryGetValue(node, out var newValue) ? newValue : node;
}
}
}