C# CodeWriter.WritePropertyGet方法代码示例

        private void WriteClassChild(CodeWriter writer, Association child, bool hasDuplicates, Database schema, GenerationContext context)
        {
            // the following is apparently useless
            DbLinq.Schema.Dbml.Table targetTable = schema.Tables.FirstOrDefault(t => t.Type.Name == child.Type);
            if (targetTable == null)
            {
                //Logger.Write(Level.Error, "ERROR L143 target table class not found:" + child.Type);
                return;
            }

            var storageAttribute = NewAttributeDefinition<AssociationAttribute>();
            storageAttribute["Storage"] = child.Storage;
            storageAttribute["OtherKey"] = child.OtherKey;
            storageAttribute["ThisKey"] = child.ThisKey;
            storageAttribute["Name"] = child.Name;

            SpecificationDefinition specifications;
            if (child.AccessModifierSpecified)
                specifications = GetSpecificationDefinition(child.AccessModifier);
            else
                specifications = SpecificationDefinition.Public;
            if (child.ModifierSpecified)
                specifications |= GetSpecificationDefinition(child.Modifier);

            var propertyName = hasDuplicates
                                   ? child.Member + "_" + string.Join("", child.OtherKeys.ToArray())
                                   : child.Member;

            var propertyType = writer.GetGenericName(TypeExtensions.GetShortName(typeof(EntitySet<>)), child.Type);

            if (child.Storage != null)
                writer.WriteField(SpecificationDefinition.Private, child.Storage, propertyType);

            using (writer.WriteAttribute(storageAttribute))
            using (writer.WriteAttribute(NewAttributeDefinition<DebuggerNonUserCodeAttribute>()))
            using (writer.WriteProperty(specifications, propertyName,
                                        writer.GetGenericName(TypeExtensions.GetShortName(typeof(EntitySet<>)), child.Type)))
            {
                // if we have a backing field, use it
                if (child.Storage != null)
                {
                    // the getter returns the field
                    using (writer.WritePropertyGet())
                    {
                        writer.WriteLine(writer.GetReturnStatement(
                            child.Storage
                            ));
                    }
                    // the setter assigns the field
                    using (writer.WritePropertySet())
                    {
                        writer.WriteLine(writer.GetStatement(
                            writer.GetAssignmentExpression(
                            child.Storage,
                            writer.GetPropertySetValueExpression())
                            ));
                    }
                }
                // otherwise, use automatic property
                else
                    writer.WriteAutomaticPropertyGetSet();
            }
            writer.WriteLine();
        }

        protected virtual void WriteClassParent(CodeWriter writer, Association parent, bool hasDuplicates, Database schema, GenerationContext context)
        {
            // the following is apparently useless
            DbLinq.Schema.Dbml.Table targetTable = schema.Tables.FirstOrDefault(t => t.Type.Name == parent.Type);
            if (targetTable == null)
            {
                //Logger.Write(Level.Error, "ERROR L191 target table type not found: " + parent.Type + "  (processing " + parent.Name + ")");
                return;
            }

            string member = parent.Member;
            string storageField = parent.Storage;
            // TODO: remove this
            if (member == parent.ThisKey)
            {
                member = parent.ThisKey + targetTable.Type.Name; //repeat name to prevent collision (same as Linq)
                storageField = "_x_" + parent.Member;
            }

            writer.WriteField(SpecificationDefinition.Private, storageField,
                              writer.GetGenericName(TypeExtensions.GetShortName(typeof(EntityRef<>)),
                                                    targetTable.Type.Name));

            var storageAttribute = NewAttributeDefinition<AssociationAttribute>();
			storageAttribute["Storage"] = storageField;
			storageAttribute["OtherKey"] = parent.OtherKey;
            storageAttribute["ThisKey"] = parent.ThisKey;
            storageAttribute["Name"] = parent.Name;
            storageAttribute["IsForeignKey"] = parent.IsForeignKey;

            SpecificationDefinition specifications;
            if (parent.AccessModifierSpecified)
                specifications = GetSpecificationDefinition(parent.AccessModifier);
            else
                specifications = SpecificationDefinition.Public;
            if (parent.ModifierSpecified)
                specifications |= GetSpecificationDefinition(parent.Modifier);

            var propertyName = hasDuplicates
                                   ? member + "_" + string.Join("", parent.TheseKeys.ToArray())
                                   : member;

            using (writer.WriteAttribute(storageAttribute))
            using (writer.WriteAttribute(NewAttributeDefinition<DebuggerNonUserCodeAttribute>()))
            using (writer.WriteProperty(specifications, propertyName, targetTable.Type.Name))
            {
                string storage = writer.GetMemberExpression(storageField, "Entity");
                using (writer.WritePropertyGet())
                {
                    writer.WriteLine(writer.GetReturnStatement(storage));
                }
                using (writer.WritePropertySet())
                {
                    // algorithm is:
                    // 1.1. must be different than previous value
                    // 1.2. or HasLoadedOrAssignedValue is false (but why?)
                    // 2. implementations before change
                    // 3. if previous value not null
                    // 3.1. place parent in temp variable
                    // 3.2. set [Storage].Entity to null
                    // 3.3. remove it from parent list
                    // 4. assign value to [Storage].Entity
                    // 5. if value is not null
                    // 5.1. add it to parent list
                    // 5.2. set FK members with entity keys
                    // 6. else
                    // 6.1. set FK members to defaults (null or 0)
                    // 7. implementationas after change

                    //writer.WriteLine(writer.GetStatement(writer.GetAssignmentExpression(storage, writer.GetPropertySetValueExpression())));
                    var entityMember = writer.GetMemberExpression(parent.Storage, "Entity");
                    // 1.1
                    using (writer.WriteIf(writer.GetDifferentExpression(writer.GetPropertySetValueExpression(),
                                                                        entityMember)))
                    {
                        var otherAssociation = schema.GetReverseAssociation(parent);
                        // 2. code before the change
                        // TODO change interface to require a member instead of a column
                        //foreach (IImplementation implementation in context.Implementations())
                        //    implementation.WritePropertyBeforeSet(writer, ???, context);
                        // 3.
                        using (writer.WriteIf(writer.GetDifferentExpression(entityMember, writer.GetNullExpression())))
                        {
                            var previousEntityRefName = "previous" + parent.Type;
                            // 3.1.
                            writer.WriteLine(writer.GetStatement(
                                writer.GetVariableDeclarationInitialization(parent.Type, previousEntityRefName, entityMember)
                                ));
                            // 3.2.
                            writer.WriteLine(writer.GetStatement(
                                writer.GetAssignmentExpression(entityMember, writer.GetNullExpression())
                                ));
                            // 3.3.
                            writer.WriteLine(writer.GetStatement(
                                writer.GetMethodCallExpression(
                                    writer.GetMemberExpression(writer.GetMemberExpression(previousEntityRefName, otherAssociation.Member), "Remove"),
                                    writer.GetThisExpression())
                                ));
                        }
                        // 4.
//.........这里部分代码省略.........

        /// <summary>
        /// Writes property accessor
        /// </summary>
        /// <param name="writer"></param>
        /// <param name="property"></param>
        /// <param name="relatedAssociations"></param>
        /// <param name="context"></param>
        protected virtual void WriteClassPropertyAccessors(CodeWriter writer, Column property, IEnumerable<Association> relatedAssociations, GenerationContext context)
        {
            //generate [Column(...)] attribute
            var column = NewAttributeDefinition<ColumnAttribute>();
            column["Storage"] = property.Storage;
            column["Name"] = property.Name;
            column["DbType"] = property.DbType;
            // be smart: we only write attributes when they differ from the default values
            var columnAttribute = new ColumnAttribute();
            if (property.IsPrimaryKey != columnAttribute.IsPrimaryKey)
                column["IsPrimaryKey"] = property.IsPrimaryKey;
            if (property.IsDbGenerated != columnAttribute.IsDbGenerated)
                column["IsDbGenerated"] = property.IsDbGenerated;
            if (property.AutoSync != DbLinq.Schema.Dbml.AutoSync.Default)
                column["AutoSync"] = new EnumFullname("AutoSync", property.AutoSync);
            if (property.CanBeNull != columnAttribute.CanBeNull)
                column["CanBeNull"] = property.CanBeNull;
            if (property.Expression != null)
                column["Expression"] = property.Expression;

            var specifications = property.AccessModifierSpecified
                                     ? GetSpecificationDefinition(property.AccessModifier)
                                     : SpecificationDefinition.Public;
            if (property.ModifierSpecified)
                specifications |= GetSpecificationDefinition(property.Modifier);

            //using (WriteAttributes(writer, context.Parameters.MemberExposedAttributes))
            using (WriteAttributes(writer, GetAttributeNames(context, context.Parameters.MemberAttributes)))
            using (writer.WriteAttribute(NewAttributeDefinition<DebuggerNonUserCodeAttribute>()))
            using (writer.WriteAttribute(column))
            using (writer.WriteProperty(specifications, property.Member, GetTypeOrExtendedType(writer, property)))
            {
                // on auto storage, we're just lazy
                if (property.Storage == null)
                    writer.WriteAutomaticPropertyGetSet();
                else
                {
                    using (writer.WritePropertyGet())
                    {
                        writer.WriteLine(writer.GetReturnStatement(writer.GetVariableExpression(property.Storage)));
                    }
                    using (writer.WritePropertySet())
                    {
                        WriteClassPropertyAccessorSet(writer, property, relatedAssociations, context);
                    }
                }
            }
        }