Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Extensions / UI / WebControls / Expressions / RangeExpression.cs / 1305376 / RangeExpression.cs
#if ORYX_VNEXT namespace Microsoft.Web.Data.UI.WebControls.Expressions { using System.Web; #else namespace System.Web.UI.WebControls.Expressions { #endif using System; using System.Collections; using System.Collections.Generic; using System.Collections.Specialized; using System.ComponentModel; using System.Diagnostics; using System.Linq; using System.Linq.Expressions; using System.Web.Resources; using System.Web.UI; using System.Web.UI.WebControls; public class RangeExpression : ParameterDataSourceExpression { public string DataField { get { return (string)ViewState["DataField"] ?? String.Empty; } set { ViewState["DataField"] = value; } } public RangeType MinType { get { object o = ViewState["MinType"]; return o != null ? (RangeType)o : RangeType.None; } set { ViewState["MinType"] = value; } } public RangeType MaxType { get { object o = ViewState["MaxType"]; return o != null ? (RangeType)o : RangeType.None; } set { ViewState["MaxType"] = value; } } internal virtual new IOrderedDictionary GetValues() { return Parameters.GetValues(Context, Owner); } public override IQueryable GetQueryable(IQueryable source) { if (source == null) { return null; } if (String.IsNullOrEmpty(DataField)) { throw new InvalidOperationException(AtlasWeb.Expressions_DataFieldRequired); } IOrderedDictionary values = GetValues(); ParameterExpression parameterExpression = Expression.Parameter(source.ElementType, String.Empty); Expression properyExpression = ExpressionHelper.GetValue(ExpressionHelper.CreatePropertyExpression(parameterExpression, DataField)); if (MinType == RangeType.None && MaxType == RangeType.None) { throw new InvalidOperationException(AtlasWeb.RangeExpression_RangeTypeMustBeSpecified); } Expression minExpression = null; Expression maxExpression = null; if (MinType != RangeType.None) { if (values.Count == 0) { throw new InvalidOperationException(AtlasWeb.RangeExpression_MinimumValueRequired); } if (values[0] != null) { minExpression = GetMinRangeExpression(properyExpression, values[0], MinType); } } if (MaxType != RangeType.None) { if (values.Count == 0 || ((minExpression != null) && (values.Count == 1))) { throw new InvalidOperationException(AtlasWeb.RangeExpression_MaximumValueRequired); } object maxValue = minExpression == null ? values[0] : values[1]; if (maxValue != null) { maxExpression = GetMaxRangeExpression(properyExpression, maxValue, MaxType); } } if ((maxExpression == null) && (minExpression == null)) { return null; } Expression rangeExpression = CreateRangeExpressionBody(minExpression, maxExpression); return ExpressionHelper.Where(source, Expression.Lambda(rangeExpression, parameterExpression)); } private static Expression GetMinRangeExpression(Expression propertyExpression, object value, RangeType rangeType) { ConstantExpression constantValue = Expression.Constant(ExpressionHelper.BuildObjectValue(value, propertyExpression.Type)); switch (rangeType) { case RangeType.Exclusive: return Expression.GreaterThan(propertyExpression, constantValue); case RangeType.None: return null; case RangeType.Inclusive: return Expression.GreaterThanOrEqual(propertyExpression, constantValue); default: Debug.Fail("shouldn't get here!"); return null; } } private static Expression GetMaxRangeExpression(Expression propertyExpression, object value, RangeType rangeType) { ConstantExpression constantValue = Expression.Constant(ExpressionHelper.BuildObjectValue(value, propertyExpression.Type)); switch (rangeType) { case RangeType.Exclusive: return Expression.LessThan(propertyExpression, constantValue); case RangeType.None: return null; case RangeType.Inclusive: return Expression.LessThanOrEqual(propertyExpression, constantValue); default: Debug.Fail("shouldn't get here!"); return null; } } private static Expression CreateRangeExpressionBody(Expression minExpression, Expression maxExpression) { if (minExpression == null && maxExpression == null) { return null; } if (minExpression == null) { return maxExpression; } if (maxExpression == null) { return minExpression; } return Expression.AndAlso(minExpression, maxExpression); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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