新增对IEnumerable对象的Reduce可以先提供初始值后提供缩减方法的重载

Falcon.SugarApi.Test/IEnumerableExtendTest.cs

@@ -83,6 +83,8 @@ namespace Falcon.SugarApi.Test
             var list = new List<int> { 1,2,3,4 };
             var sum = list.Reduce((a,b) => a + b,0);
             Assert.IsTrue(sum == 10,"对数组求和错误");
+            sum = list.Reduce(0,(a,b) => a + b);
+            Assert.IsTrue(sum == 10,"对数组求和错误");
 
             var people = new List<person> {
                 new person{ IsMan=true,age=30 },
@@ -92,6 +94,8 @@ namespace Falcon.SugarApi.Test
             };
             var sumage = people.Reduce((a,b) => a + (b.IsMan ? b.age : 0),0);
             Assert.IsTrue(sumage == 30 + 50 + 60,"有条件求和错误");
+            sumage = people.Reduce(0,(a,b) => b.IsMan ? a + b.age : a);
+            Assert.IsTrue(sumage == 30 + 50 + 60,"有条件求和错误");
 
             var men = people.Reduce((a,b) => {
                 if(b.IsMan) {
@@ -102,6 +106,15 @@ namespace Falcon.SugarApi.Test
             foreach(var p in men) {
                 Assert.IsTrue(p.IsMan,"缩减为男性集合错误！");
             }
+            men = people.Reduce(new List<person>(),(a,b) => {
+                if(b.IsMan) {
+                    a.Add(b);
+                }
+                return a;
+            });
+            foreach(var p in men) {
+                Assert.IsTrue(p.IsMan,"缩减为男性集合错误！");
+            }
 
             var arr = new string[] { };
             var initVal = arr.Reduce((a,b) => throw new Exception("空集合不可以调用缩减方法"),"abc");

Falcon.SugarApi/IEnumerableExtend.cs

@@ -41,8 +41,7 @@ namespace Falcon.SugarApi
                         var val = p.GetValue(i);
                         try {
                             row[p.Name] = val;
-                        }
+                        } catch(Exception ex) {
-                        catch (Exception ex) {
                             throw new Exception($"值设置失败！{p.Name}:{val}",ex);
                         }
                     }
@@ -104,5 +103,25 @@ namespace Falcon.SugarApi
             }
             return result;
         }
+
+        /// <summary>
+        /// 对枚举进行缩减，并返回缩减后的结果。
+        /// </summary>
+        /// <typeparam name="T">枚举的类型</typeparam>
+        /// <typeparam name="TR">缩减结果类型</typeparam>
+        /// <param name="source">原枚举</param>
+        /// <param name="reduceFunc">缩减方法</param>
+        /// <param name="initialValue">缩减初始值</param>
+        /// <returns>缩减结果</returns>
+        public static TR Reduce<T, TR>(this IEnumerable<T> source,TR initialValue,Func<TR,T,TR> reduceFunc) {
+            if(reduceFunc == null) {
+                throw new ArgumentNullException(nameof(reduceFunc));
+            }
+            var result = initialValue;
+            foreach(var i in source) {
+                result = reduceFunc(result,i);
+            }
+            return result;
+        }
     }
 }