修复了因使用全局命名空间导致的源码中缺失引用的问题

PublicTypes/Exceptions.cs

@@ -1,4 +1,5 @@
-using Flee.InternalTypes;
+using System;
+using Flee.InternalTypes;
 using Flee.Parsing;
 using Flee.Resources;
 
@@ -20,7 +21,7 @@ namespace Flee.PublicTypes
     /// <summary>
     /// 
     /// </summary>
-    [Serializable()]
+    [Serializable]
     public sealed class ExpressionCompileException : Exception
     {
         private readonly CompileExceptionReason _myReason;

PublicTypes/ExpressionContext.cs

@@ -1,4 +1,6 @@
-using Flee.CalcEngine.InternalTypes;
+using System;
+using System.IO;
+using Flee.CalcEngine.InternalTypes;
 using Flee.CalcEngine.PublicTypes;
 using Flee.ExpressionElements.Base;
 using Flee.InternalTypes;

PublicTypes/ExpressionImports.cs

@@ -1,4 +1,6 @@
-using System.Reflection;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
 using Flee.InternalTypes;
 using Flee.Resources;
 

PublicTypes/ExpressionOptions.cs

@@ -1,6 +1,8 @@
 using System.Reflection;
 using System.Globalization;
 using Flee.InternalTypes;
+using System;
+using System.Collections.Generic;
 
 
 namespace Flee.PublicTypes

PublicTypes/ImportTypes.cs

@@ -1,4 +1,6 @@
-using System.Reflection;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
 using Flee.InternalTypes;
 using Flee.Resources;
 

PublicTypes/Miscellaneous.cs

@@ -1,4 +1,7 @@
-namespace Flee.PublicTypes
+using System;
+using System.Collections.Generic;
+
+namespace Flee.PublicTypes
 {
     public interface IExpression
     {

PublicTypes/VariableCollection.cs

@@ -1,5 +1,7 @@
 using Flee.InternalTypes;
 using Flee.Resources;
+using System;
+using System.Collections.Generic;
 using System.ComponentModel;
 using System.Reflection;