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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / ModelProviders / ColumnProvider.cs / 1305376 / ColumnProvider.cs
using System.Collections.Generic; using System.ComponentModel; using System.ComponentModel.DataAnnotations; using System.Diagnostics.CodeAnalysis; using System.Reflection; using System.Web.DynamicData; using System.Web.DynamicData.Util; namespace System.Web.DynamicData.ModelProviders { ////// Base provider class for columns. /// Each provider type (e.g. Linq To Sql, Entity Framework, 3rd party) extends this class. /// public abstract class ColumnProvider { private bool? _isReadOnly; ////// ctor /// /// the table this column belongs to protected ColumnProvider(TableProvider table) { if (table == null) { throw new ArgumentNullException("table"); } Table = table; } ////// readable representation /// ///[SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")] public override string ToString() { // To help identifying objects in debugger return Name ?? base.ToString(); } internal virtual PropertyDescriptor PropertyDescriptor { get { return Table.GetTypeDescriptor().GetProperties().Find(Name, true/*ignoreCase*/); } } public virtual AttributeCollection Attributes { get { var propertyDescriptor = PropertyDescriptor; var attributes = propertyDescriptor != null ? propertyDescriptor.Attributes : AttributeCollection.Empty; return AddDefaultAttributes(this, attributes); } } protected static AttributeCollection AddDefaultAttributes(ColumnProvider columnProvider, AttributeCollection attributes) { List extraAttributes = new List (); // If there is no required attribute and the Provider says required, add one var requiredAttribute = attributes.FirstOrDefault (); if (requiredAttribute == null && !columnProvider.Nullable) { extraAttributes.Add(new RequiredAttribute()); } // If there is no StringLength attribute and it's a string, add one var stringLengthAttribute = attributes.FirstOrDefault (); int maxLength = columnProvider.MaxLength; if (stringLengthAttribute == null && columnProvider.ColumnType == typeof(String) && maxLength > 0) { extraAttributes.Add(new StringLengthAttribute(maxLength)); } // If we need any extra attributes, create a new collection if (extraAttributes.Count > 0) { attributes = AttributeCollection.FromExisting(attributes, extraAttributes.ToArray()); } return attributes; } /// /// The name of the column /// public virtual string Name { get; protected set; } ////// The CLR type of the column /// public virtual Type ColumnType { get; protected set; } ////// Is this column a primary key in its table /// public virtual bool IsPrimaryKey { get; protected set; } ////// Specifies if this column is read only /// public virtual bool IsReadOnly { get { if (_isReadOnly == null) { var propertyDescriptor = PropertyDescriptor; _isReadOnly = propertyDescriptor != null ? propertyDescriptor.IsReadOnly : false; } return _isReadOnly.Value; } protected set { _isReadOnly = value; } } ////// Is it a database generated column /// public virtual bool IsGenerated { get; protected set; } ////// Returns whether the underlying model supports sorting of the table on this column /// [SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Sortable", Justification="It's a valid word")] public virtual bool IsSortable { get; protected set; } ////// The maximun length allowed for this column (applies to string columns) /// public virtual int MaxLength { get; protected set; } ////// Does it allow null values (meaning it is not required) /// public virtual bool Nullable { get; protected set; } ////// meant to indicate that a member is an extra property that was declared in a partial class /// public virtual bool IsCustomProperty { get; protected set; } ////// If the column represents and association with anther table, this returns the association information. /// Otherwise, null is returned. /// public virtual AssociationProvider Association { get; protected set; } ////// The table that this column belongs to /// public TableProvider Table { get; private set; } ////// The PropertyInfo of the property that represents this column on the entity type /// public virtual PropertyInfo EntityTypeProperty { get; protected set; } ////// This is set for columns that are part of a foreign key. Note that it is NOT set for /// the strongly typed entity ref columns (though those columns 'use' one or more columns /// where IsForeignKeyComponent is set). /// public virtual bool IsForeignKeyComponent { get; protected set; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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