C# HttpRequest.ODataProperties方法代码示例

		public virtual object ApplyQueryOptions(object value, HttpRequest request, ActionDescriptor actionDescriptor, AssembliesResolver assembliesResolver)
		{
			var elementClrType = value is IEnumerable
				? TypeHelper.GetImplementedIEnumerableType(value.GetType())
				: value.GetType();

			var model = request.ODataProperties().Model;
			if (model == null)
			{
				throw Error.InvalidOperation(SRResources.QueryGetModelMustNotReturnNull);
			}

			var queryContext = new ODataQueryContext(
				model,
				elementClrType,
				assembliesResolver,
				request.ODataProperties().Path
				);

			var queryOptions = new ODataQueryOptions(queryContext, request, assembliesResolver);

			var enumerable = value as IEnumerable;
			if (enumerable == null)
			{
				// response is single entity.
				return value;
			}

			// response is a collection.
			var query = (value as IQueryable) ?? enumerable.AsQueryable();

			query = queryOptions.ApplyTo(query,
				new ODataQuerySettings
				{
					// TODO: If we are using SQL, set this to false
					// otherwise if it is entities in code then
					// set it to true
					HandleNullPropagation = 
					//HandleNullPropagationOption.True
					HandleNullPropagationOptionHelper.GetDefaultHandleNullPropagationOption(query),
					PageSize = actionDescriptor.PageSize(),
					SearchDerivedTypeWhenAutoExpand = true
				},
				AllowedQueryOptions.None);
			// Determine if this result should be a single entity
			
			if (ODataCountMediaTypeMapping.IsCountRequest(request))
			{
				long? count = request.ODataProperties().TotalCount;

				if (count.HasValue)
				{
					// Return the count value if it is a $count request.
					return count.Value;
				}
			}
			return query;
		}

        ///// <summary>
        ///// Initializes a new instance of the <see cref="ODataCountMediaTypeMapping"/> class.
        ///// </summary>
        //public ODataCountMediaTypeMapping()
        //    : base("text/plain")
        //{
        //}

        ///// <inheritdoc/>
        //public override double TryMatchMediaType(HttpRequestMessage request)
        //{
        //    if (request == null)
        //    {
        //        throw Error.ArgumentNull("request");
        //    }

        //    return IsCountRequest(request) ? 1 : 0;
        //}

        internal static bool IsCountRequest(HttpRequest request)
        {
            ODataPath path = request.ODataProperties().Path;
            return path != null && path.Segments.LastOrDefault() is CountPathSegment;
        }