ACCEDER AUX PROPRIÉTÉS DU PROFILE VIA UN EXPRESSIONBUILDER PERSONNALISÉ

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.Compilation;
using System.CodeDom;
using System.Web.UI;


[ExpressionPrefix("Profile")]
public class ProfileExpressionBuilder : ExpressionBuilder
{
    /// <summary>
    /// When overridden in a derived class, returns an object that represents the parsed expression.
    /// </summary>
    /// <param name="expression">The value of the declarative expression.</param>
    /// <param name="propertyType">The type of the property bound to by the expression.</param>
    /// <param name="context">Contextual information for the evaluation of the expression.</param>
    /// <returns>
    /// An <see cref="T:System.Object"></see> containing the parsed representation of the expression; otherwise, null if <see cref="M:System.Web.Compilation.ExpressionBuilder.ParseExpression(System.String,System.Type,System.Web.Compilation.ExpressionBuilderContext)"></see> is not implemented.
    /// </returns>
    public override object ParseExpression(string expression, Type propertyType, ExpressionBuilderContext context)
    {
        return expression;
    }

    /// <summary>
    /// When overridden in a derived class, returns code that is used during page execution to obtain the evaluated expression.
    /// </summary>
    /// <param name="entry">The object that represents information about the property bound to by the expression.</param>
    /// <param name="parsedData">The object containing parsed data as returned by <see cref="M:System.Web.Compilation.ExpressionBuilder.ParseExpression(System.String,System.Type,System.Web.Compilation.ExpressionBuilderContext)"></see>.</param>
    /// <param name="context">Contextual information for the evaluation of the expression.</param>
    /// <returns>
    /// A <see cref="T:System.CodeDom.CodeExpression"></see> that is used for property assignment.
    /// </returns>
    public override CodeExpression GetCodeExpression(BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
    {

        String propertyName = (String)parsedData;
        CodePrimitiveExpression prim = new CodePrimitiveExpression(propertyName);
        CodeExpression[] args = new CodeExpression[1] { prim };

        CodeTypeReferenceExpression refType = new CodeTypeReferenceExpression(base.GetType());
        return new CodeMethodInvokeExpression(refType, "GetProperty", args);

    }

    /// <summary>
    /// Gets the value of the specified Profile Property.
    /// </summary>
    /// <param name="propertyName">Name of the Profile property.</param>
    /// <returns></returns>
    public static Object GetProperty(String propertyName)
    {
        return HttpContext.Current.Profile.GetPropertyValue( propertyName);
    }

    /// <summary>
    /// When overridden in a derived class, returns an object that represents an evaluated expression.
    /// </summary>
    /// <param name="target">The object containing the expression.</param>
    /// <param name="entry">The object that represents information about the property bound to by the expression.</param>
    /// <param name="parsedData">The object containing parsed data as returned by <see cref="M:System.Web.Compilation.ExpressionBuilder.ParseExpression(System.String,System.Type,System.Web.Compilation.ExpressionBuilderContext)"></see>.</param>
    /// <param name="context">Contextual information for the evaluation of the expression.</param>
    /// <returns>
    /// An object that represents the evaluated expression; otherwise, null if the inheritor does not implement <see cref="M:System.Web.Compilation.ExpressionBuilder.EvaluateExpression(System.Object,System.Web.UI.BoundPropertyEntry,System.Object,System.Web.Compilation.ExpressionBuilderContext)"></see>.
    /// </returns>
    public override object EvaluateExpression(object target, BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
    {
        return GetProperty((String)parsedData); 
    }

    /// <summary>
    /// When overridden in a derived class, returns a value indicating whether the current <see cref="T:System.Web.Compilation.ExpressionBuilder"></see> object supports no-compile pages.
    /// </summary>
    /// <value></value>
    /// <returns>true if the <see cref="T:System.Web.Compilation.ExpressionBuilder"></see> supports expression evaluation; otherwise, false.</returns>
    public override bool SupportsEvaluate
    {
        get
        {
            return true; 
        }
    }
}

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14 décembre 2006 16:50:58 :

rajout de l'adresse du post de mon blog :-)