fix

Author: toolgood

csharp/ToolGood.Algorithm/Internals/AntlrCharStream.cs

@@ -19,7 +19,7 @@ namespace ToolGood.Algorithm.Internals
     /// </summary>
     sealed class AntlrCharStream : ICharStream
     {
-        private ICharStream stream;
+        private readonly ICharStream stream;
 
         /// <summary>
         /// Constructs a new CaseChangingCharStream wrapping the given <paramref name="stream"/> forcing

csharp/ToolGood.Algorithm/Internals/ConditionTree.cs

@@ -54,7 +54,7 @@ public static ConditionTree Parse(string condition)
             ConditionTree tree = new ConditionTree();
             if (string.IsNullOrWhiteSpace(condition)) {
                 tree.Type = ConditionTreeType.Error;
-                tree.ErrorMessage = "condition 为空";
+                tree.ErrorMessage = "condition is null";
                 return tree;
             }
             try {

csharp/ToolGood.Algorithm/Internals/Functions/FunctionBase.value.cs

@@ -8,8 +8,8 @@ namespace ToolGood.Algorithm.Internals.Functions
 {
     internal class Function_Value : FunctionBase
     {
-        private Operand _value;
-        private string _showName;
+        private readonly Operand _value;
+        private readonly string _showName;
 
         public Function_Value(Operand value)
         {
@@ -97,8 +97,8 @@ public override void ToString(StringBuilder stringBuilder, bool addBrackets)
 
     internal class Function_NUM : FunctionBase
     {
-        private decimal d;
-        private string unit;
+        private readonly decimal d;
+        private readonly string unit;
 
         public Function_NUM(decimal func1, string func2)
         {
@@ -121,8 +121,8 @@ public override void ToString(StringBuilder stringBuilder, bool addBrackets)
 
     internal class Function_PARAMETER : FunctionBase
     {
-        private string name;
-        private FunctionBase func1;
+        private readonly string name;
+        private readonly FunctionBase func1;
 
         public Function_PARAMETER(string name)
         {