Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Designer / System / data / design / DesignRelation.cs / 1 / DesignRelation.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All Rights Reserved. // Information Contained Herein is Proprietary and Confidential. // //----------------------------------------------------------------------------- namespace System.Data.Design{ using System; using System.Collections; using System.Collections.Specialized; using System.Data; using System.ComponentModel; using System.ComponentModel.Design; using System.Diagnostics; ////// This is the design time Relation class /// ----------------------------------------- /// The important thing is that we are using this object to present both DataRelation and ForeignKeyConstraint /// One DesignRelation may contain both DataRelation and ForeignKeyConstraint or only ForeignKeyConstraint, /// all code to access this object should know about it, and take care that DataRelation could be null. /// And there are a strange status in DataSet, where the DataRelation and the constraint don't match each other, /// they could have different names, and different DataColumns. That's a very strange status, and we don't support it well. /// (Actually, when you create a DataRelation, a matched constraint will be created for you. It only happens when you change /// the DataRelation, but haven't changed the constraint. I think that our designer should prevent it happens /// However, if it happened, and saved into the schema file, we won't show the constraint. (That only happens when you write /// code to operate DataSet, create a relation, remove the relation but not the constraint, then create another relation). /// internal class DesignRelation: DataSourceComponent, IDataSourceNamedObject{ internal const string NAMEROOT = "Relation"; private DesignDataSource owner; private DataRelation dataRelation; private ForeignKeyConstraint dataForeignKeyConstraint; private const string EXTPROPNAME_USER_RELATIONNAME = "Generator_UserRelationName"; private const string EXTPROPNAME_USER_PARENTTABLE = "Generator_UserParentTable"; private const string EXTPROPNAME_USER_CHILDTABLE = "Generator_UserChildTable"; private const string EXTPROPNAME_GENERATOR_RELATIONVARNAME = "Generator_RelationVarName"; private const string EXTPROPNAME_GENERATOR_PARENTPROPNAME = "Generator_ParentPropName"; private const string EXTPROPNAME_GENERATOR_CHILDPROPNAME = "Generator_ChildPropName"; public DesignRelation(DataRelation dataRelation) { this.DataRelation = dataRelation; } public DesignRelation(ForeignKeyConstraint foreignKeyConstraint) { this.DataRelation = null; this.dataForeignKeyConstraint = foreignKeyConstraint; } internal DataColumn[] ChildDataColumns { get { if (dataRelation != null) { return dataRelation.ChildColumns; } else if (dataForeignKeyConstraint != null) { return dataForeignKeyConstraint.Columns; } return new DataColumn[0]; } } internal DesignTable ChildDesignTable { get { DataTable childTable = null; if (dataRelation != null) { childTable = dataRelation.ChildTable; } else if (dataForeignKeyConstraint != null) { childTable = dataForeignKeyConstraint.Table; } if (childTable != null && Owner != null) { return Owner.DesignTables[childTable]; } return null; } } internal DataRelation DataRelation{ get{ return dataRelation; } set { dataRelation = value; if (dataRelation != null) { dataForeignKeyConstraint = null; } } } internal ForeignKeyConstraint ForeignKeyConstraint { get { if (dataRelation != null && dataRelation.ChildKeyConstraint != null){ return dataRelation.ChildKeyConstraint; } return dataForeignKeyConstraint; } set { dataForeignKeyConstraint = value; } } ////// [ MergableProperty(false), DefaultValue("") ] public string Name { get{ if (dataRelation != null){ return dataRelation.RelationName; } else if (dataForeignKeyConstraint != null) { return dataForeignKeyConstraint.ConstraintName; } Debug.Fail("Access a null dataRelation & null foreignKeyConstraint"); return string.Empty; } set{ Debug.Assert(dataRelation != null, "Access a null dataRelation & null foreignKeyConstraint"); if (!StringUtil.EqualValue(this.Name, value)) { if (this.CollectionParent != null) { CollectionParent.ValidateUniqueName(this, value); } if (dataRelation != null) { dataRelation.RelationName = value; } if (dataForeignKeyConstraint != null) { dataForeignKeyConstraint.ConstraintName = value; } } } } ////// Owner is typically set when this is added to the designrelation collection /// internal DesignDataSource Owner { get { return this.owner; } set { this.owner = value; } } internal DataColumn[] ParentDataColumns { get { if (dataRelation != null) { return dataRelation.ParentColumns; } else if (dataForeignKeyConstraint != null) { return dataForeignKeyConstraint.RelatedColumns; } return new DataColumn[0]; } } internal DesignTable ParentDesignTable { get { DataTable parentTable = null; if (dataRelation != null) { parentTable = dataRelation.ParentTable; } else if (dataForeignKeyConstraint != null) { parentTable = dataForeignKeyConstraint.RelatedTable; } if (parentTable != null && Owner != null) { return Owner.DesignTables[parentTable]; } return null; } } [Browsable(false)] public string PublicTypeName { get { return NAMEROOT; } } [Flags] public enum CompareOption { Columns, Tables, ForeignKeyConstraints } internal string UserRelationName { get { return this.dataRelation.ExtendedProperties[EXTPROPNAME_USER_RELATIONNAME] as string; } set { this.dataRelation.ExtendedProperties[EXTPROPNAME_USER_RELATIONNAME] = value; } } internal string UserParentTable { get { return this.dataRelation.ExtendedProperties[EXTPROPNAME_USER_PARENTTABLE] as string; } set { this.dataRelation.ExtendedProperties[EXTPROPNAME_USER_PARENTTABLE] = value; } } internal string UserChildTable { get { return this.dataRelation.ExtendedProperties[EXTPROPNAME_USER_CHILDTABLE] as string; } set { this.dataRelation.ExtendedProperties[EXTPROPNAME_USER_CHILDTABLE] = value; } } internal string GeneratorRelationVarName { get { return this.dataRelation.ExtendedProperties[EXTPROPNAME_GENERATOR_RELATIONVARNAME] as string; } set { this.dataRelation.ExtendedProperties[EXTPROPNAME_GENERATOR_RELATIONVARNAME] = value; } } internal string GeneratorChildPropName { get { return this.dataRelation.ExtendedProperties[EXTPROPNAME_GENERATOR_CHILDPROPNAME] as string; } set { this.dataRelation.ExtendedProperties[EXTPROPNAME_GENERATOR_CHILDPROPNAME] = value; } } internal string GeneratorParentPropName { get { return this.dataRelation.ExtendedProperties[EXTPROPNAME_GENERATOR_PARENTPROPNAME] as string; } set { this.dataRelation.ExtendedProperties[EXTPROPNAME_GENERATOR_PARENTPROPNAME] = value; } } internal override StringCollection NamingPropertyNames { get { StringCollection namingPropNames = new StringCollection(); namingPropNames.AddRange(new string[] { "typedParent", "typedChildren" }); return namingPropNames; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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