public void FirstDispositionTypeThrows()
{
Assert.ThrowsArgumentNull(() => { HttpContentCollectionExtensions.FirstDispositionType(null, "A"); }, "contents");
IEnumerable <HttpContent> content = HttpContentCollectionExtensionsTests.CreateContent();
Assert.ThrowsArgumentNull(() => { HttpContentCollectionExtensions.FirstDispositionType(content, null); }, "dispositionType");
foreach (string empty in TestData.EmptyStrings)
{
Assert.ThrowsArgumentNull(() => { HttpContentCollectionExtensions.FirstDispositionType(content, empty); }, "dispositionType");
}
}
/// <summary>
/// Returns the first <see cref="HttpContent"/> in a sequence that has a <see cref="ContentDispositionHeaderValue"/> header field
/// with a <see cref="ContentDispositionHeaderValue.DispositionType"/> property equal to <paramref name="dispositionType"/>.
/// </summary>
/// <param name="contents">The contents to evaluate</param>
/// <param name="dispositionType">The disposition type to look for.</param>
/// <returns>null if source is empty or if no element matches; otherwise the first <see cref="HttpContent"/> in
/// the sequence with a matching disposition type.</returns>
public static HttpContent FirstDispositionTypeOrDefault(this IEnumerable <HttpContent> contents, string dispositionType)
{
if (contents == null)
{
throw new ArgumentNullException("contents");
}
if (String.IsNullOrWhiteSpace(dispositionType))
{
throw new ArgumentNullException("dispositionType");
}
return(contents.FirstOrDefault((item) =>
{
return HttpContentCollectionExtensions.FirstDispositionType(item, dispositionType);
}));
}