Static analysis: Use ??=

src/EFCore.Cosmos/Infrastructure/Internal/CosmosModelValidator.cs

@@ -128,10 +128,7 @@ protected virtual void ValidateSharedContainerCompatibility(
                 break;
             }
 
-            if (firstEntityType == null)
-            {
-                firstEntityType = entityType;
-            }
+            firstEntityType ??= entityType;
 
             if (entityType.ClrType.IsInstantiable()
                 && entityType.GetContainingPropertyName() == null)

src/EFCore.Design/Design/DesignTimeServiceCollectionExtensions.cs

@@ -34,10 +34,7 @@ public static IServiceCollection AddEntityFrameworkDesignTimeServices(
         IOperationReporter? reporter = null,
         Func<IServiceProvider>? applicationServiceProviderAccessor = null)
     {
-        if (reporter == null)
-        {
-            reporter = new OperationReporter(handler: null);
-        }
+        reporter ??= new OperationReporter(handler: null);
 
         new EntityFrameworkRelationalDesignServicesBuilder(services)
             .TryAddProviderSpecificServices(

src/EFCore.Design/Migrations/Design/MigrationsScaffolder.cs

@@ -352,12 +352,9 @@ public virtual MigrationFiles RemoveMigration(
                 modelSnapshotName,
                 model);
 
-            if (modelSnapshotFile == null)
-            {
-                modelSnapshotFile = Path.Combine(
-                    GetDirectory(projectDir, null, GetSubNamespace(rootNamespace, modelSnapshotNamespace)),
-                    modelSnapshotFileName);
-            }
+            modelSnapshotFile ??= Path.Combine(
+                GetDirectory(projectDir, null, GetSubNamespace(rootNamespace, modelSnapshotNamespace)),
+                modelSnapshotFileName);
 
             Dependencies.OperationReporter.WriteInformation(DesignStrings.RevertingSnapshot);
             File.WriteAllText(modelSnapshotFile, modelSnapshotCode, Encoding.UTF8);

src/EFCore.Design/Scaffolding/Internal/ReverseEngineerScaffolder.cs

@@ -88,10 +88,7 @@ public virtual ScaffoldedModel ScaffoldModel(
             _reporter.WriteWarning(DesignStrings.SensitiveInformationWarning);
         }
 
-        if (codeOptions.ConnectionString == null)
-        {
-            codeOptions.ConnectionString = connectionString;
-        }
+        codeOptions.ConnectionString ??= connectionString;
 
         var databaseModel = _databaseModelFactory.Create(resolvedConnectionString, databaseOptions);
         var modelConnectionString = (string?)(databaseModel[ScaffoldingAnnotationNames.ConnectionString]);

src/EFCore.InMemory/Query/Internal/InMemoryQueryExpression.cs

@@ -831,10 +831,7 @@ void IPrintableExpression.Print(ExpressionPrinter expressionPrinter)
 
     private InMemoryQueryExpression Clone()
     {
-        if (_cloningExpressionVisitor == null)
-        {
-            _cloningExpressionVisitor = new CloningExpressionVisitor();
-        }
+        _cloningExpressionVisitor ??= new CloningExpressionVisitor();
 
         return (InMemoryQueryExpression)_cloningExpressionVisitor.Visit(this);
     }

src/EFCore.InMemory/Query/Internal/InMemoryShapedQueryCompilingExpressionVisitor.ShaperExpressionProcessingExpressionVisitor.cs

@@ -57,11 +57,8 @@ public LambdaExpression ProcessShaper(Expression shaperExpression)
             _expressions.Add(result);
             result = Expression.Block(_variables, _expressions);
 
-            if (_valueBufferParameter == null)
-            {
-                // If parameter is null then the projection is not really server correlated so we can just put anything.
-                _valueBufferParameter = Expression.Parameter(typeof(ValueBuffer));
-            }
+            // If parameter is null then the projection is not really server correlated so we can just put anything.
+            _valueBufferParameter ??= Expression.Parameter(typeof(ValueBuffer));
 
             return Expression.Lambda(result, QueryCompilationContext.QueryContextParameter, _valueBufferParameter);
         }
@@ -95,10 +92,7 @@ protected override Expression VisitExtension(Expression extensionExpression)
                         variable = Expression.Parameter(projectionBindingExpression.Type);
                         _variables.Add(variable);
                         var queryExpression = (InMemoryQueryExpression)projectionBindingExpression.QueryExpression;
-                        if (_valueBufferParameter == null)
-                        {
-                            _valueBufferParameter = queryExpression.CurrentParameter;
-                        }
+                        _valueBufferParameter ??= queryExpression.CurrentParameter;
 
                         var projectionIndex = queryExpression.GetProjection(projectionBindingExpression).GetConstantValue<int>();
 
@@ -215,10 +209,7 @@ protected override Expression VisitBinary(BinaryExpression binaryExpression)
 
                 var projectionBindingExpression = (ProjectionBindingExpression)newExpression.Arguments[0];
                 var queryExpression = (InMemoryQueryExpression)projectionBindingExpression.QueryExpression;
-                if (_valueBufferParameter == null)
-                {
-                    _valueBufferParameter = queryExpression.CurrentParameter;
-                }
+                _valueBufferParameter ??= queryExpression.CurrentParameter;
 
                 _materializationContextBindings[parameterExpression]
                     = queryExpression.GetProjection(projectionBindingExpression).GetConstantValue<Dictionary<IProperty, int>>();

src/EFCore.InMemory/Storage/Internal/InMemoryStore.cs

@@ -204,10 +204,7 @@ public virtual int ExecuteTransaction(
     // Must be called from inside the lock
     private IInMemoryTable EnsureTable(IEntityType entityType)
     {
-        if (_tables == null)
-        {
-            _tables = CreateTables();
-        }
+        _tables ??= CreateTables();
 
         IInMemoryTable? baseTable = null;
 

src/EFCore.Relational/Extensions/RelationalPropertyExtensions.cs

@@ -148,10 +148,7 @@ public static string GetDefaultColumnName(this IReadOnlyProperty property, in St
                 break;
             }
 
-            if (builder == null)
-            {
-                builder = new StringBuilder();
-            }
+            builder ??= new StringBuilder();
 
             builder.Insert(0, "_");
             builder.Insert(0, ownership.PrincipalToDependent!.Name);

src/EFCore.Relational/Metadata/Conventions/CheckConstraintConvention.cs

@@ -117,21 +117,15 @@ public virtual void ProcessEntityTypeBaseTypeChanged(
                                 baseCheckConstraint.EntityType.DisplayName()));
                     }
 
-                    if (checkConstraintsToBeRemoved == null)
-                    {
-                        checkConstraintsToBeRemoved = new List<IConventionCheckConstraint>();
-                    }
+                    checkConstraintsToBeRemoved ??= new List<IConventionCheckConstraint>();
 
                     checkConstraintsToBeRemoved.Add(checkConstraint);
                     continue;
                 }
 
                 if (baseCheckConstraint != null)
                 {
-                    if (checkConstraintsToBeDetached == null)
-                    {
-                        checkConstraintsToBeDetached = new List<IConventionCheckConstraint>();
-                    }
+                    checkConstraintsToBeDetached ??= new List<IConventionCheckConstraint>();
 
                     checkConstraintsToBeDetached.Add(checkConstraint);
                 }

src/EFCore.Relational/Metadata/Conventions/TableNameFromDbSetConvention.cs

@@ -32,10 +32,7 @@ public TableNameFromDbSetConvention(
             }
             else
             {
-                if (ambiguousTypes == null)
-                {
-                    ambiguousTypes = new List<Type>();
-                }
+                ambiguousTypes ??= new List<Type>();
 
                 ambiguousTypes.Add(set.Type);
             }

src/EFCore.Relational/Metadata/Conventions/TableSharingConcurrencyTokenConvention.cs

@@ -89,10 +89,7 @@ public virtual void ProcessModelFinalizing(
 
                     if (!foundMappedProperty)
                     {
-                        if (entityTypesMissingConcurrencyColumn == null)
-                        {
-                            entityTypesMissingConcurrencyColumn = new Dictionary<IConventionEntityType, IReadOnlyProperty>();
-                        }
+                        entityTypesMissingConcurrencyColumn ??= new Dictionary<IConventionEntityType, IReadOnlyProperty>();
 
                         // store the entity type which is missing the
                         // concurrency token property, mapped to an example
@@ -166,10 +163,7 @@ public virtual void ProcessModelFinalizing(
                     continue;
                 }
 
-                if (concurrencyColumns == null)
-                {
-                    concurrencyColumns = new Dictionary<string, List<IReadOnlyProperty>>();
-                }
+                concurrencyColumns ??= new Dictionary<string, List<IReadOnlyProperty>>();
 
                 if (!concurrencyColumns.TryGetValue(columnName, out var properties))
                 {

src/EFCore.Relational/Metadata/Internal/InternalCheckConstraintBuilder.cs

@@ -98,10 +98,7 @@ public virtual bool CanSetName(string? name, ConfigurationSource configurationSo
                     return null;
                 }
 
-                if (checkConstraintsToBeDetached == null)
-                {
-                    checkConstraintsToBeDetached = new List<IConventionCheckConstraint>();
-                }
+                checkConstraintsToBeDetached ??= new List<IConventionCheckConstraint>();
 
                 checkConstraintsToBeDetached.Add(derivedCheckConstraint);
             }

src/EFCore.Relational/Metadata/Internal/RelationalModel.cs

@@ -1001,18 +1001,12 @@ private static void PopulateRowInternalForeignKeys(TableBase table)
                     && !foreignKey.PrincipalEntityType.IsAssignableFrom(foreignKey.DeclaringEntityType)
                     && ((ITableBase)table).EntityTypeMappings.Any(m => m.EntityType == foreignKey.PrincipalEntityType))
                 {
-                    if (rowInternalForeignKeys == null)
-                    {
-                        rowInternalForeignKeys = new SortedSet<IForeignKey>(ForeignKeyComparer.Instance);
-                    }
+                    rowInternalForeignKeys ??= new SortedSet<IForeignKey>(ForeignKeyComparer.Instance);
 
                     rowInternalForeignKeys.Add(foreignKey);
 
-                    if (referencingInternalForeignKeyMap == null)
-                    {
-                        referencingInternalForeignKeyMap =
-                            new SortedDictionary<IEntityType, IEnumerable<IForeignKey>>(EntityTypeFullNameComparer.Instance);
-                    }
+                    referencingInternalForeignKeyMap ??=
+                        new SortedDictionary<IEntityType, IEnumerable<IForeignKey>>(EntityTypeFullNameComparer.Instance);
 
                     var principalEntityType = foreignKey.PrincipalEntityType;
                     if (!referencingInternalForeignKeyMap.TryGetValue(principalEntityType, out var internalReferencingForeignKeys))

src/EFCore.Relational/Migrations/MigrationBuilder.cs

@@ -837,10 +837,7 @@ public virtual CreateTableBuilder<TColumns> CreateTable<TColumns>(
         foreach (var property in typeof(TColumns).GetTypeInfo().DeclaredProperties)
         {
             var addColumnOperation = ((IInfrastructure<AddColumnOperation>)property.GetMethod!.Invoke(columnsObject, null)!).Instance;
-            if (addColumnOperation.Name == null)
-            {
-                addColumnOperation.Name = property.Name;
-            }
+            addColumnOperation.Name ??= property.Name;
             // TODO: addColumnOperation.Validate();
 
             columnMap.Add(property, addColumnOperation);

src/EFCore.Relational/Query/SqlExpressions/SelectExpression.Helper.cs

@@ -241,10 +241,7 @@ private sealed class ColumnExpressionFindingExpressionVisitor : ExpressionVisito
                     var tableAlias = columnExpression.TableAlias!;
                     if (_columnReferenced!.ContainsKey(tableAlias))
                     {
-                        if (_columnReferenced[tableAlias] == null)
-                        {
-                            _columnReferenced[tableAlias] = new HashSet<string>();
-                        }
+                        _columnReferenced[tableAlias] ??= new HashSet<string>();
 
                         _columnReferenced[tableAlias]!.Add(columnExpression.Name);
                     }

src/EFCore.Relational/Query/SqlExpressions/SelectExpression.cs

@@ -2855,10 +2855,7 @@ public void PrepareForAggregate()
     [EntityFrameworkInternal]
     public SelectExpression Clone()
     {
-        if (_cloningExpressionVisitor == null)
-        {
-            _cloningExpressionVisitor = new CloningExpressionVisitor();
-        }
+        _cloningExpressionVisitor ??= new CloningExpressionVisitor();
 
         return (SelectExpression)_cloningExpressionVisitor.Visit(this);
     }

src/EFCore.Relational/Storage/RelationalCommand.cs

@@ -508,10 +508,7 @@ public virtual RelationalDataReader ExecuteReader(RelationalCommandParameterObje
                 reader = new BufferedDataReader(reader, detailedErrorsEnabled).Initialize(readerColumns);
             }
 
-            if (_relationalReader == null)
-            {
-                _relationalReader = CreateRelationalDataReader();
-            }
+            _relationalReader ??= CreateRelationalDataReader();
 
             _relationalReader.Initialize(parameterObject.Connection, command, reader, commandId, logger);
 
@@ -633,10 +630,7 @@ await logger.CommandErrorAsync(
                     .ConfigureAwait(false);
             }
 
-            if (_relationalReader == null)
-            {
-                _relationalReader = CreateRelationalDataReader();
-            }
+            _relationalReader ??= CreateRelationalDataReader();
 
             _relationalReader.Initialize(parameterObject.Connection, command, reader, commandId, logger);
 

src/EFCore.Relational/Storage/RelationalTypeMappingSource.cs

@@ -212,10 +212,7 @@ protected override CoreTypeMapping FindMapping(in TypeMappingInfo mappingInfo)
                 }
             }
 
-            if (isFixedLength == null)
-            {
-                isFixedLength = principal.IsFixedLength();
-            }
+            isFixedLength ??= principal.IsFixedLength();
         }
 
         var storeTypeNameBase = ParseStoreTypeName(storeTypeName, out var unicode, out var size, out var precision, out var scale);
@@ -281,25 +278,10 @@ protected override CoreTypeMapping FindMapping(in TypeMappingInfo mappingInfo)
                 storeTypeBaseName = ParseStoreTypeName(
                     storeTypeName, out var parsedUnicode, out var parsedSize, out var parsedPrecision, out var parsedScale);
 
-                if (size == null)
-                {
-                    size = parsedSize;
-                }
-
-                if (precision == null)
-                {
-                    precision = parsedPrecision;
-                }
-
-                if (scale == null)
-                {
-                    scale = parsedScale;
-                }
-
-                if (isUnicode == null)
-                {
-                    isUnicode = parsedUnicode;
-                }
+                size ??= parsedSize;
+                precision ??= parsedPrecision;
+                scale ??= parsedScale;
+                isUnicode ??= parsedUnicode;
             }
 
             var isFixedLength = (bool?)typeConfiguration[RelationalAnnotationNames.IsFixedLength];
@@ -411,25 +393,11 @@ protected override CoreTypeMapping FindMapping(in TypeMappingInfo mappingInfo)
         {
             storeTypeBaseName = ParseStoreTypeName(
                 storeTypeName, out var parsedUnicode, out var parsedSize, out var parsedPrecision, out var parsedScale);
-            if (size == null)
-            {
-                size = parsedSize;
-            }
-
-            if (precision == null)
-            {
-                precision = parsedPrecision;
-            }
 
-            if (scale == null)
-            {
-                scale = parsedScale;
-            }
-
-            if (unicode == null)
-            {
-                unicode = parsedUnicode;
-            }
+            size ??= parsedSize;
+            precision ??= parsedPrecision;
+            scale ??= parsedScale;
+            unicode ??= parsedUnicode;
         }
 
         return FindMappingWithConversion(

src/EFCore.Relational/Update/Internal/CommandBatchPreparer.cs

@@ -167,10 +167,7 @@ protected virtual IEnumerable<IReadOnlyModificationCommand> CreateModificationCo
                 var isMainEntry = true;
                 if (table.IsShared)
                 {
-                    if (sharedTablesCommandsMap == null)
-                    {
-                        sharedTablesCommandsMap = new Dictionary<(string, string?), SharedTableEntryMap<IModificationCommand>>();
-                    }
+                    sharedTablesCommandsMap ??= new Dictionary<(string, string?), SharedTableEntryMap<IModificationCommand>>();
 
                     var tableKey = (table.Name, table.Schema);
                     if (!sharedTablesCommandsMap.TryGetValue(tableKey, out var sharedCommandsMap))

src/EFCore.Relational/Update/ModificationCommand.cs

@@ -213,10 +213,7 @@ public virtual IColumnModification AddColumnModification(in ColumnModificationPa
     {
         var modification = CreateColumnModification(columnModificationParameters);
 
-        if (_columnModifications == null)
-        {
-            _columnModifications = new List<IColumnModification>();
-        }
+        _columnModifications ??= new List<IColumnModification>();
 
         _columnModifications.Add(modification);