linq增加标准差计算方法

ldqk · Mar 10, 2021 · 05a4b42 · 05a4b42
1 parent 499232b
commit 05a4b42
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Showing 12 changed files with 219 additions and 177 deletions.
diff --git a/Masuit.Tools.Abstractions/Extensions/BaseType/IEnumerableExtensions.cs b/Masuit.Tools.Abstractions/Extensions/BaseType/IEnumerableExtensions.cs
@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Linq.Expressions;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -252,5 +253,199 @@ public static Task ForAsync<T>(this IEnumerable<T> source, Func<T, int, Task> se
         {
             return Task.WhenAll(source.Select(selector));
         }
+
+        /// <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).DefaultIfEmpty().Max();
+
+        /// <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) => source.Select(selector).DefaultIfEmpty(defaultValue).Max();
+
+        /// <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) => source.DefaultIfEmpty().Max();
+
+        /// <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) => source.DefaultIfEmpty(defaultValue).Max();
+
+        /// <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) => source.Select(selector).DefaultIfEmpty(defaultValue).Max();
+
+        /// <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 IEnumerable<TSource> source, Func<TSource, TResult> selector) => source.Select(selector).DefaultIfEmpty().Max();
+
+        /// <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.DefaultIfEmpty().Max();
+
+        /// <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) => source.DefaultIfEmpty(defaultValue).Max();
+
+        /// <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).DefaultIfEmpty().Min();
+
+        /// <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) => source.Select(selector).DefaultIfEmpty(defaultValue).Min();
+
+        /// <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.DefaultIfEmpty().Min();
+
+        /// <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) => source.DefaultIfEmpty(defaultValue).Min();
+
+        /// <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).DefaultIfEmpty().Min();
+
+        /// <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) => source.Select(selector).DefaultIfEmpty(defaultValue).Min();
+
+        /// <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.DefaultIfEmpty().Min();
+
+        /// <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) => source.DefaultIfEmpty(defaultValue).Min();
+
+        /// <summary>
+        /// 标准差
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="source"></param>
+        /// <param name="selector"></param>
+        /// <returns></returns>
+        public static TResult StandardDeviation<T, TResult>(this IEnumerable<T> source, Func<T, TResult> selector) where TResult : IConvertible
+        {
+            return StandardDeviation(source.Select(t => selector(t).ConvertTo<double>())).ConvertTo<TResult>();
+        }
+
+        /// <summary>
+        /// 标准差
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static T StandardDeviation<T>(this IEnumerable<T> source) where T : IConvertible
+        {
+            return StandardDeviation(source.Select(t => t.ConvertTo<double>())).ConvertTo<T>();
+        }
+
+        /// <summary>
+        /// 标准差
+        /// </summary>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        public static double StandardDeviation(this IEnumerable<double> source)
+        {
+            double result = 0;
+            int count = source.Count();
+            if (count > 1)
+            {
+                double avg = source.Average();
+                double sum = source.Sum(d => (d - avg) * (d - avg));
+                result = Math.Sqrt(sum / count);
+            }
+
+            return result;
+        }
     }
 }
diff --git a/Masuit.Tools.Abstractions/Extensions/BaseType/ValueTypeConvertExtensions.cs b/Masuit.Tools.Abstractions/Extensions/BaseType/ValueTypeConvertExtensions.cs
@@ -49,19 +49,19 @@ public static decimal ToDecimal(this string s, decimal defaultValue = 0)
         }
 
         /// <summary>
-        /// 字符串转decimal
+        /// 转decimal
         /// </summary>
-        /// <param name="s">源字符串</param>
+        /// <param name="s"></param>
         /// <returns>int类型的数字</returns>
         public static decimal ToDecimal(this double s)
         {
             return new decimal(s);
         }
 
         /// <summary>
-        /// 字符串转double
+        /// 转double
         /// </summary>
-        /// <param name="s">源字符串</param>
+        /// <param name="s"></param>
         /// <returns>double类型的数据</returns>
         public static double ToDouble(this decimal s)
         {

diff --git a/Masuit.Tools.Abstractions/Linq/LinqExtension.cs b/Masuit.Tools.Abstractions/Linq/LinqExtension.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using System.Linq.Expressions;
 
 namespace Masuit.Tools.Linq
@@ -47,158 +46,6 @@ private static Expression<Func<T, bool>> CombineLambdas<T>(this Expression<Func<
             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).DefaultIfEmpty().Max();
-
-        /// <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) => source.Select(selector).DefaultIfEmpty(defaultValue).Max();
-
-        /// <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) => source.DefaultIfEmpty().Max();
-
-        /// <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) => source.DefaultIfEmpty(defaultValue).Max();
-
-        /// <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) => source.Select(selector).DefaultIfEmpty(defaultValue).Max();
-
-        /// <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 IEnumerable<TSource> source, Func<TSource, TResult> selector) => source.Select(selector).DefaultIfEmpty().Max();
-
-        /// <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.DefaultIfEmpty().Max();
-
-        /// <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) => source.DefaultIfEmpty(defaultValue).Max();
-
-        /// <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).DefaultIfEmpty().Min();
-
-        /// <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) => source.Select(selector).DefaultIfEmpty(defaultValue).Min();
-
-        /// <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.DefaultIfEmpty().Min();
-
-        /// <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) => source.DefaultIfEmpty(defaultValue).Min();
-
-        /// <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).DefaultIfEmpty().Min();
-
-        /// <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) => source.Select(selector).DefaultIfEmpty(defaultValue).Min();
-
-        /// <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.DefaultIfEmpty().Min();
-
-        /// <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) => source.DefaultIfEmpty(defaultValue).Min();
     }
 
     internal class SubstituteParameterVisitor : ExpressionVisitor