/// <summary>
/// While creating a media entity, we could only post with its binary media resource.
/// If we want to add values to its non-media properties, we need to to update/patch the entity
/// instance with those property values.
/// </summary>
/// <returns></returns>
private async Task UpdateNonMediaProperty(IODataEntity entity, string value)
{
string keyProeprtyName = "pk";
string propertyName = "title";
// We do not update the key property. Only remains those proeprties to be updated.
entity.Properties.Remove(keyProeprtyName);
var prop = new ODataProperty(propertyName);
prop.Value = value;
entity.Properties[propertyName] = prop;
var req = new ODataRequestParametersSingle(entity.EditResourcePath, RequestMode.Update, entity);
req.Etag = entity.Etag;
try
{
var exec = Store.ScheduleRequest(req);
await exec.Response;
}
catch (Exception ex)
{
result.Text += ex.Message + "\n";
}
}
private async Task <int> QueryEntityCount(string entitySet)
{
if (Store == null)
{
return(-1);
}
ODataRequestParametersSingle requestParameters = new ODataRequestParametersSingle(entitySet + "/$count");
IODataRequestExecution exec = Store.ScheduleRequest(requestParameters);
await exec.Response;
ODataRawValue rawValue = (ODataRawValue)((IODataResponseSingle)exec.Response.Result).Payload;
return(Int32.Parse(rawValue.Value));
}
public async Task <IODataEntity> CreateStreamEntity()
{
var stream = await pickAPicture();
if (stream == null)
{
return(null);
}
Windows.Storage.Streams.Buffer buffer = new Windows.Storage.Streams.Buffer((uint)stream.Size);
await stream.ReadAsync(buffer, (uint)stream.Size, InputStreamOptions.None);
DataReader dataReader = DataReader.FromBuffer(buffer);
byte[] bytes = new byte[buffer.Length];
dataReader.ReadBytes(bytes);
ODataRequestParametersSingle req;
IODataResponse resp;
IODataRequestExecution exec;
req = new ODataRequestParametersSingle("Photos", RequestMode.Create, new ODataUploadMediaResource(bytes, stream.ContentType));
try
{
exec = Store.ScheduleRequest(req);
resp = await exec.Response;
}
catch (Exception ex)
{
result.Text += ex.Message + "\n";
return(null);
}
if (((ODataResponseSingle)resp).PayloadType == ODataType.Error)
{
return(null);
}
else
{
ODataEntity entity = (ODataEntity)((ODataResponseSingle)resp).Payload;
await UpdateNonMediaProperty(entity, "Added at: " + DateTime.Now.ToString());
return(entity);
}
}
public async Task <bool> DeleteStreamEntity(IODataEntity mediaEntity)
{
ODataRequestParametersSingle req;
IODataResponse resp;
IODataRequestExecution exec;
req = new ODataRequestParametersSingle(mediaEntity.EditResourcePath, RequestMode.Delete, mediaEntity);
try
{
exec = Store.ScheduleRequest(req);
resp = await exec.Response;
return(true);
}
catch (Exception ex)
{
result.Text += ex.Message + "\n";
return(false);
}
}
public async Task <bool> UpdateStreamEntity(IODataEntity mediaEntity)
{
var stream = await pickAPicture();
if (stream == null)
{
return(false);
}
Windows.Storage.Streams.Buffer buffer = new Windows.Storage.Streams.Buffer((uint)stream.Size);
await stream.ReadAsync(buffer, (uint)stream.Size, InputStreamOptions.None);
DataReader dataReader = DataReader.FromBuffer(buffer);
byte[] bytes = new byte[buffer.Length];
dataReader.ReadBytes(bytes);
ODataRequestParametersSingle req;
IODataResponse resp;
IODataRequestExecution exec;
req = new ODataRequestParametersSingle(mediaEntity.EditMediaLink.ToString(), RequestMode.Update, new ODataUploadMediaResource(bytes, stream.ContentType));
req.Etag = mediaEntity.MediaEtag;
try
{
exec = Store.ScheduleRequest(req);
resp = await exec.Response;
await UpdateNonMediaProperty(mediaEntity, "Updated at: " + DateTime.Now.ToString());
return(true);
}
catch (Exception ex)
{
result.Text += ex.Message + "\n";
return(false);
}
}
