Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / ModelProviders / DLinqColumnProvider.cs / 1305376 / DLinqColumnProvider.cs
using System.Collections.Generic; using System.ComponentModel; using System.ComponentModel.DataAnnotations; using System.Data.Linq; using System.Data.Linq.Mapping; using System.Globalization; using System.Reflection; using System.Text.RegularExpressions; using System.Xml.Linq; namespace System.Web.DynamicData.ModelProviders { internal sealed class DLinqColumnProvider : ColumnProvider { private static Regex s_varCharRegEx = new Regex(@"N?(?:Var)?Char\(([0-9]+)\)", RegexOptions.IgnoreCase); // accepts char, nchar, varchar, and nvarchar private AttributeCollection _attributes; private AssociationProvider _association; private bool _isAssociation; public DLinqColumnProvider(DLinqTableProvider table, MetaDataMember member) : base(table) { Member = member; Name = member.Name; ColumnType = GetMemberType(member); IsPrimaryKey = member.IsPrimaryKey; IsGenerated = member.IsDbGenerated; _isAssociation = member.IsAssociation; IsCustomProperty = !member.IsAssociation && Member.DbType == null; Nullable = Member.IsAssociation ? Member.Association.IsNullable : Member.CanBeNull; MaxLength = ProcessMaxLength(ColumnType, Member.DbType); IsSortable = ProcessIsSortable(ColumnType, Member.DbType); } public override AttributeCollection Attributes { get { if (!Member.IsDiscriminator) return base.Attributes; if (_attributes == null) { ListnewAttributes = new List (); bool foundScaffoldAttribute = false; foreach (Attribute attr in base.Attributes) { if (attr is ScaffoldColumnAttribute) { foundScaffoldAttribute = true; break; } newAttributes.Add(attr); } if (foundScaffoldAttribute) _attributes = base.Attributes; else { newAttributes.Add(new ScaffoldColumnAttribute(false)); _attributes = new AttributeCollection(newAttributes.ToArray()); } } return _attributes; } } // internal to facilitate unit testing internal static int ProcessMaxLength(Type memberType, String dbType) { // Only strings and chars that come in from a database have max lengths if (dbType == null || (memberType != typeof(string) && Misc.RemoveNullableFromType(memberType) != typeof(char))) return 0; if (dbType.StartsWith("NText", StringComparison.OrdinalIgnoreCase)) { return Int32.MaxValue >> 1; // see sql server 2005 spec for ntext } if (dbType.StartsWith("Text", StringComparison.OrdinalIgnoreCase)) { return Int32.MaxValue; // see sql server 2005 spec for text } if (dbType.StartsWith("NVarChar(MAX)", StringComparison.OrdinalIgnoreCase)) { return (Int32.MaxValue >> 1) - 2; // see sql server 2005 spec for nvarchar } if (dbType.StartsWith("VarChar(MAX)", StringComparison.OrdinalIgnoreCase)) { return Int32.MaxValue - 2; // see sql server 2005 spec for varchar } Match m = s_varCharRegEx.Match(dbType); if (m.Success) { return Int32.Parse(m.Groups[1].Value, CultureInfo.InvariantCulture); } return 0; } internal static bool ProcessIsSortable(Type memberType, String dbType) { if (dbType == null) return false; if (memberType == typeof(string) && (dbType.StartsWith("Text", StringComparison.OrdinalIgnoreCase) || dbType.StartsWith("NText", StringComparison.OrdinalIgnoreCase))) { return false; } if (memberType == typeof(Binary) && dbType.StartsWith("Image", StringComparison.OrdinalIgnoreCase)) { return false; } if (memberType == typeof(XElement)) { return false; } return true; } internal MetaDataMember Member { get; private set; } internal void Initialize() { if (_isAssociation && _association == null) { _association = new DLinqAssociationProvider(this); } } internal bool ShouldRemove { get; set; } private static Type GetMemberType(MetaDataMember member) { Type type = member.Type; if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(EntitySet<>)) { return type.GetGenericArguments()[0]; } else { return type; } } #region IEntityMember Members public override PropertyInfo EntityTypeProperty { get { return (PropertyInfo)Member.Member; } } public override AssociationProvider Association { get { Initialize(); return _association; } } internal new bool IsForeignKeyComponent { set { base.IsForeignKeyComponent = value; } } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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