fix

Author: linzhijun

csharp/ToolGood.Algorithm/Internals/Functions/MathSum/Function_MODE.cs

@@ -23,8 +23,8 @@ public override Operand Evaluate(AlgorithmEngine engine, Func<AlgorithmEngine, s
 
             var dict = new Dictionary<decimal, int>();
             foreach (var item in list) {
-                if (dict.ContainsKey(item)) {
-                    dict[item] += 1;
+                if (dict.TryGetValue(item, out int count)) {
+                    dict[item] = count + 1;
                 } else {
                     dict[item] = 1;
                 }

csharp/ToolGood.Algorithm/Operand.cs

@@ -39,11 +39,15 @@ public abstract class Operand
 		/// Null
 		/// </summary>
 		public static readonly Operand Null = new OperandNull();
-		private static readonly Operand[] IntCache = new Operand[256];
+
+		// 整数缓存范围: -1000 ~ 1000，共2001个值
+		private const int IntCacheOffset = 1000;
+		private const int IntCacheSize = 2001;
+		private static readonly Operand[] IntCache = new Operand[IntCacheSize];
 		static Operand()
 		{
-			for (int i = 0; i < 256; i++)
-				IntCache[i] = new OperandInt(i - 128);
+			for (int i = 0; i < IntCacheSize; i++)
+				IntCache[i] = new OperandInt(i - IntCacheOffset);
 		}
 
 		#region  IsNull IsNumber IsText IsBoolean IsArray IsDate IsJson IsArrayJson IsError ErrorMsg
@@ -171,8 +175,8 @@ public static Operand Create(short obj)
 		/// <returns></returns>
 		public static Operand Create(int obj)
 		{
-			if (obj >= -128 && obj <= 127)
-				return IntCache[obj + 128];
+			if (obj >= -IntCacheOffset && obj <= IntCacheOffset)
+				return IntCache[obj + IntCacheOffset];
 			return new OperandInt(obj);
 		}