Fixed warnings. Fixed negate in LambdaInvokeExpression.

Author: JanKallman

src/EPPlus/ExcelStyles.cs

@@ -557,7 +557,7 @@ private void SetStyleCells(StyleBase sender, StyleChangeEventArgs e, ExcelAddres
                                     }
                                     else
                                     {
-                                        int r = 0, c = col;
+                                        int c = col;
                                         if ( ws.ColumnLookup.TryGetExcelColumn(c, out ExcelColumn colVal) )
                                         {
                                             c = colVal.ColumnMin;

src/EPPlus/FormulaParsing/DependencyChain/RpnFormulaExecution.cs

@@ -1275,7 +1275,7 @@ private static FormulaRangeAddress[] ExecuteNextToken(RpnOptimizedDependencyChai
                                 }
                             }
                         }
-                        catch(Exception exp)
+                        catch
                         {
                             f._expressionStack.Push(ErrorExpression.ValueError);
                         }

src/EPPlus/FormulaParsing/Excel/Functions/RefAndLookup/LookupUtils/LookupBinarySearch.cs

@@ -11,8 +11,6 @@ Date               Author                       Change
  22/3/2023         EPPlus Software AB           EPPlus v7
 *************************************************************************************************/
 
-using OfficeOpenXml.Utils;
-using OfficeOpenXml.Utils;
 using System.Collections.Generic;
 
 namespace OfficeOpenXml.FormulaParsing.Excel.Functions.RefAndLookup.LookupUtils

src/EPPlus/FormulaParsing/FormulaExpressions/LambdaFunctionExpression.cs

@@ -22,7 +22,6 @@ internal class LambdaFunctionExpression : VariableFunctionExpression
     {
         internal override bool IsLambda => true;
         internal override bool HandlesVariables => true;
-        private List<Token> _lambdaTokens;
 
         internal LambdaFunctionExpression(string tokenValue, ParsingContext ctx, int pos) : base(tokenValue, ctx, pos)
         {

src/EPPlus/FormulaParsing/FormulaExpressions/LambdaInvokeExpression.cs

@@ -23,7 +23,7 @@ internal LambdaInvokeExpression(LambdaCalculationExpression exp, ParsingContext
             this._function = new Lambda();
         }
 
-        private bool _negate = false;
+//        private bool _negate = false;
         private readonly LambdaCalculationExpression _calculationExpression;
         private readonly List<CompileResult> _lambdaArguments = new List<CompileResult>();
 
@@ -52,14 +52,25 @@ public override CompileResult Compile()
                 var arg = _lambdaArguments[i];
                 calculator.SetVariableValue(i, arg.Result, arg.DataType, Context, arg.Address);
             }
+
             var result = calculator.Execute(Context);
-            return result;
-        }
 
-        public override Expression Negate()
-        {
-            _negate = !_negate;
-            return this;
+            if (_negate != 0)
+            {
+                if (result.IsNumeric == false)
+                {
+                    if (Context.Debug)
+                    {
+                        var msg = string.Format("Trying to negate a non-numeric value ({0}) in a lambda function '{1}'",
+                            result.Result, nameof(_function));
+                        Context.Configuration.Logger.Log(Context, msg);
+                    }
+                    return new CompileResult(ExcelErrorValue.Create(eErrorType.Value), DataType.ExcelError);
+                }
+                return new CompileResult(result.ResultNumeric * _negate, result.DataType);
+            }
+
+            return result;
         }
 
         internal override void OnDispose()

src/EPPlus/FormulaParsing/ParsingContext.cs

@@ -166,6 +166,7 @@ public ExcelWorksheet CurrentWorksheet
         }
 
         internal RemoteCallManager RemoteCallManager { get;  }= new RemoteCallManager();
+        /// <summary>
         /// Calculation options/parameters set for the Calculate call.
         /// </summary>
         public ExcelCalculationOption CalcOption { get; set; }