DataServiceQueryOfT.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / DataServiceQueryOfT.cs / 1 / DataServiceQueryOfT.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
// query object
//  
//--------------------------------------------------------------------- 

namespace System.Data.Services.Client 
{
    using System;
    using System.Collections.Generic;
    using System.Diagnostics; 
    using System.IO;
    using System.Linq; 
    using System.Linq.Expressions; 
#if !ASTORIA_LIGHT // Data.Services http stack
    using System.Net; 
#else
    using System.Data.Services.Http;
#endif
    using System.Text; 
    using System.Xml;
    using System.Reflection; 
 
    /// 
    /// query object 
    /// 
    /// type of object to materialize
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix", Justification = "required for this feature")]
    public class DataServiceQuery : DataServiceQuery, IQueryable 
    {
        /// Linq Expression 
        private readonly Expression queryExpression; 

        /// Linq Query Provider 
        private readonly DataServiceQueryProvider queryProvider;

        /// 
        /// query object 
        /// 
        /// expression for query 
        /// query provider for query 
        private DataServiceQuery(Expression expression, DataServiceQueryProvider provider)
        { 
            Debug.Assert(null != provider.Context, "null context");
            Debug.Assert(expression != null, "null expression");
            Debug.Assert(provider is DataServiceQueryProvider, "Currently only support Web Query Provider");
 
            this.queryExpression = expression;
            this.queryProvider = provider; 
        } 

        #region IQueryable implementation 
        /// 
        /// Element Type
        /// 
        public override Type ElementType 
        {
            get { return typeof(TElement); } 
        } 

        ///  
        /// Linq Expression
        /// 
        public override Expression Expression
        { 
            get { return this.queryExpression; }
        } 
 
        /// 
        /// Linq Query Provider 
        /// 
        public override IQueryProvider Provider
        {
            get { return this.queryProvider; } 
        }
 
        #endregion 

        ///  
        /// gets the URI for a the query
        /// 
        public override Uri RequestUri
        { 
            get { return this.queryProvider.Translate(this.queryExpression); }
        } 
 
        /// 
        /// Begins an asynchronous request to an Internet resource. 
        /// 
        /// The AsyncCallback delegate.
        /// The state object for this request.
        /// An IAsyncResult that references the asynchronous request for a response. 
        public IAsyncResult BeginExecute(AsyncCallback callback, object state)
        { 
            return base.BeginExecute(this, this.queryProvider.Context, callback, state); 
        }
 
        /// 
        /// Ends an asynchronous request to an Internet resource.
        /// 
        /// The pending request for a response.  
        /// An IEnumerable that contains the response from the Internet resource.
        public IEnumerable EndExecute(IAsyncResult asyncResult) 
        { 
            QueryAsyncResult response = QueryAsyncResult.EndExecute(this, "Execute", asyncResult);
            IEnumerable result = null; 
            if (HttpStatusCode.NoContent != response.StatusCode)
            {
                result = Materialize(this.queryProvider.Context, response.ContentType, response.GetResponseStream);
            } 

            return (IEnumerable)response.GetResponse(result, typeof(TElement)); 
        } 

#if !ASTORIA_LIGHT // Synchronous methods not available 
        /// 
        /// Returns an IEnumerable from an Internet resource.
        /// 
        /// An IEnumerable that contains the response from the Internet resource. 
        public IEnumerable Execute()
        { 
            return this.Execute(this.queryProvider.Context, this.RequestUri); 
        }
#endif 

        /// 
        /// Sets Expand option
        ///  
        /// Path to expand
        /// New DataServiceQuery with expand option 
        public DataServiceQuery Expand(string path) 
        {
            Util.CheckArgumentNull(path, "path"); 
            Util.CheckArgumentNotEmpty(path, "path");

            MethodInfo mi = typeof(DataServiceQuery).GetMethod("Expand");
            return (DataServiceQuery)this.Provider.CreateQuery( 
                Expression.Call(
                    Expression.Convert(this.Expression, typeof(DataServiceQuery)), 
                    mi, 
                    new Expression[] { Expression.Constant(path) }));
        } 

        /// 
        /// Sets user option
        ///  
        /// name of value
        /// value of option 
        /// New DataServiceQuery with expand option 
        public DataServiceQuery AddQueryOption(string name, object value)
        { 
            Util.CheckArgumentNull(name, "name");
            Util.CheckArgumentNull(value, "value");
            MethodInfo mi = typeof(DataServiceQuery).GetMethod("AddQueryOption");
            return (DataServiceQuery)this.Provider.CreateQuery( 
                Expression.Call(
                    Expression.Convert(this.Expression, typeof(DataServiceQuery)), 
                    mi, 
                    new Expression[] { Expression.Constant(name), Expression.Constant(value, typeof(object)) }));
        } 

        /// 
        /// get an enumerator materializes the objects the Uri request
        ///  
        /// an enumerator
#if !ASTORIA_LIGHT // Synchronous methods not available 
        public IEnumerator GetEnumerator() 
        {
            return this.Execute().GetEnumerator(); 
        }
#else
        IEnumerator IEnumerable.GetEnumerator()
        { 
            throw Error.NotSupported();
        } 
#endif 

        ///  
        /// gets the URI for a the query
        /// 
        /// a string with the URI
        public override string ToString() 
        {
            try 
            { 
                return base.ToString();
            } 
            catch (NotSupportedException e)
            {
                return Strings.ALinq_TranslationError(e.Message);
            } 
        }
 
        ///  
        /// get an enumerator materializes the objects the Uri request
        ///  
        /// an enumerator
        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
#if !ASTORIA_LIGHT // Synchronous methods not available 
            return this.GetEnumerator();
#else 
            throw Error.NotSupported(); 
#endif
        } 

        /// enumerable list of materialized objects from stream without having to know T
        /// context
        /// contentType 
        /// function to get response stream
        /// see summary 
        internal override System.Collections.IEnumerable Materialize(DataServiceContext context, string contentType, Func response) 
        {
            return Materialize(context, contentType, response); 
        }

        /// 
        /// Ordered DataServiceQuery which implements IOrderedQueryable. 
        /// 
        internal class DataServiceOrderedQuery : DataServiceQuery, IOrderedQueryable, IOrderedQueryable 
        { 
            /// 
            /// constructor 
            /// 
            /// expression for query
            /// query provider for query
            internal DataServiceOrderedQuery(Expression expression, DataServiceQueryProvider provider) 
                : base(expression, provider)
            { 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//  
// query object
//  
//--------------------------------------------------------------------- 

namespace System.Data.Services.Client 
{
    using System;
    using System.Collections.Generic;
    using System.Diagnostics; 
    using System.IO;
    using System.Linq; 
    using System.Linq.Expressions; 
#if !ASTORIA_LIGHT // Data.Services http stack
    using System.Net; 
#else
    using System.Data.Services.Http;
#endif
    using System.Text; 
    using System.Xml;
    using System.Reflection; 
 
    /// 
    /// query object 
    /// 
    /// type of object to materialize
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix", Justification = "required for this feature")]
    public class DataServiceQuery : DataServiceQuery, IQueryable 
    {
        /// Linq Expression 
        private readonly Expression queryExpression; 

        /// Linq Query Provider 
        private readonly DataServiceQueryProvider queryProvider;

        /// 
        /// query object 
        /// 
        /// expression for query 
        /// query provider for query 
        private DataServiceQuery(Expression expression, DataServiceQueryProvider provider)
        { 
            Debug.Assert(null != provider.Context, "null context");
            Debug.Assert(expression != null, "null expression");
            Debug.Assert(provider is DataServiceQueryProvider, "Currently only support Web Query Provider");
 
            this.queryExpression = expression;
            this.queryProvider = provider; 
        } 

        #region IQueryable implementation 
        /// 
        /// Element Type
        /// 
        public override Type ElementType 
        {
            get { return typeof(TElement); } 
        } 

        ///  
        /// Linq Expression
        /// 
        public override Expression Expression
        { 
            get { return this.queryExpression; }
        } 
 
        /// 
        /// Linq Query Provider 
        /// 
        public override IQueryProvider Provider
        {
            get { return this.queryProvider; } 
        }
 
        #endregion 

        ///  
        /// gets the URI for a the query
        /// 
        public override Uri RequestUri
        { 
            get { return this.queryProvider.Translate(this.queryExpression); }
        } 
 
        /// 
        /// Begins an asynchronous request to an Internet resource. 
        /// 
        /// The AsyncCallback delegate.
        /// The state object for this request.
        /// An IAsyncResult that references the asynchronous request for a response. 
        public IAsyncResult BeginExecute(AsyncCallback callback, object state)
        { 
            return base.BeginExecute(this, this.queryProvider.Context, callback, state); 
        }
 
        /// 
        /// Ends an asynchronous request to an Internet resource.
        /// 
        /// The pending request for a response.  
        /// An IEnumerable that contains the response from the Internet resource.
        public IEnumerable EndExecute(IAsyncResult asyncResult) 
        { 
            QueryAsyncResult response = QueryAsyncResult.EndExecute(this, "Execute", asyncResult);
            IEnumerable result = null; 
            if (HttpStatusCode.NoContent != response.StatusCode)
            {
                result = Materialize(this.queryProvider.Context, response.ContentType, response.GetResponseStream);
            } 

            return (IEnumerable)response.GetResponse(result, typeof(TElement)); 
        } 

#if !ASTORIA_LIGHT // Synchronous methods not available 
        /// 
        /// Returns an IEnumerable from an Internet resource.
        /// 
        /// An IEnumerable that contains the response from the Internet resource. 
        public IEnumerable Execute()
        { 
            return this.Execute(this.queryProvider.Context, this.RequestUri); 
        }
#endif 

        /// 
        /// Sets Expand option
        ///  
        /// Path to expand
        /// New DataServiceQuery with expand option 
        public DataServiceQuery Expand(string path) 
        {
            Util.CheckArgumentNull(path, "path"); 
            Util.CheckArgumentNotEmpty(path, "path");

            MethodInfo mi = typeof(DataServiceQuery).GetMethod("Expand");
            return (DataServiceQuery)this.Provider.CreateQuery( 
                Expression.Call(
                    Expression.Convert(this.Expression, typeof(DataServiceQuery)), 
                    mi, 
                    new Expression[] { Expression.Constant(path) }));
        } 

        /// 
        /// Sets user option
        ///  
        /// name of value
        /// value of option 
        /// New DataServiceQuery with expand option 
        public DataServiceQuery AddQueryOption(string name, object value)
        { 
            Util.CheckArgumentNull(name, "name");
            Util.CheckArgumentNull(value, "value");
            MethodInfo mi = typeof(DataServiceQuery).GetMethod("AddQueryOption");
            return (DataServiceQuery)this.Provider.CreateQuery( 
                Expression.Call(
                    Expression.Convert(this.Expression, typeof(DataServiceQuery)), 
                    mi, 
                    new Expression[] { Expression.Constant(name), Expression.Constant(value, typeof(object)) }));
        } 

        /// 
        /// get an enumerator materializes the objects the Uri request
        ///  
        /// an enumerator
#if !ASTORIA_LIGHT // Synchronous methods not available 
        public IEnumerator GetEnumerator() 
        {
            return this.Execute().GetEnumerator(); 
        }
#else
        IEnumerator IEnumerable.GetEnumerator()
        { 
            throw Error.NotSupported();
        } 
#endif 

        ///  
        /// gets the URI for a the query
        /// 
        /// a string with the URI
        public override string ToString() 
        {
            try 
            { 
                return base.ToString();
            } 
            catch (NotSupportedException e)
            {
                return Strings.ALinq_TranslationError(e.Message);
            } 
        }
 
        ///  
        /// get an enumerator materializes the objects the Uri request
        ///  
        /// an enumerator
        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
        {
#if !ASTORIA_LIGHT // Synchronous methods not available 
            return this.GetEnumerator();
#else 
            throw Error.NotSupported(); 
#endif
        } 

        /// enumerable list of materialized objects from stream without having to know T
        /// context
        /// contentType 
        /// function to get response stream
        /// see summary 
        internal override System.Collections.IEnumerable Materialize(DataServiceContext context, string contentType, Func response) 
        {
            return Materialize(context, contentType, response); 
        }

        /// 
        /// Ordered DataServiceQuery which implements IOrderedQueryable. 
        /// 
        internal class DataServiceOrderedQuery : DataServiceQuery, IOrderedQueryable, IOrderedQueryable 
        { 
            /// 
            /// constructor 
            /// 
            /// expression for query
            /// query provider for query
            internal DataServiceOrderedQuery(Expression expression, DataServiceQueryProvider provider) 
                : base(expression, provider)
            { 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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