/// <summary>
/// Get an element from a table by its id.
/// </summary>
/// <param name="id">
/// The id of the element.
/// </param>
/// <param name="parameters">
/// A dictionary of user-defined parameters and values to include in
/// the request URI query string.
/// </param>
/// <returns>
/// The desired element as JSON object.
/// </returns>
private async Task <JObject> GetSingleValueAsync(object id, IDictionary <string, string> parameters)
{
Debug.Assert(id != null);
// Create a query for just this item
string query = string.Format(
CultureInfo.InvariantCulture,
"$filter=({0} eq {1})",
MobileServiceSystemColumns.Id,
FilterBuildingExpressionVisitor.ToODataConstant(id));
// Send the query
QueryResult response = await this.ReadAsync(query, parameters, MobileServiceFeatures.TypedTable);
return(GetSingleValue(response));
}
/// <summary>
/// Get an element from a table by its id.
/// </summary>
/// <param name="id">
/// The id of the element.
/// </param>
/// <param name="parameters">
/// A dictionary of user-defined parameters and values to include in
/// the request URI query string.
/// </param>
/// <returns>
/// The desired element as JSON object.
/// </returns>
private async Task <string> GetSingleValueAsync(object id, IDictionary <string, string> parameters)
{
Debug.Assert(id != null);
// Create a query for just this item
string query = string.Format(
CultureInfo.InvariantCulture,
"$filter={0} eq {1}",
MobileServiceUrlBuilder.IdPropertyName,
FilterBuildingExpressionVisitor.ToODataConstant(id));
// Send the query
JToken response = await this.ReadAsync(query, parameters);
// Get the first element in the response
JObject obj = response as JObject;
if (obj == null)
{
JArray array = response as JArray;
if (array != null && array.Count > 0)
{
obj = array.FirstOrDefault() as JObject;
}
}
if (obj == null)
{
string responseStr = response != null?response.ToString() : "null";
throw new InvalidOperationException(
string.Format(
CultureInfo.InvariantCulture,
Resources.MobileServiceTable_NotSingleObject,
responseStr));
}
return(obj.ToString());
}
