/// <summary>
/// Returns the integer value in the datasource or null if none is found.
/// </summary>
/// <param name="datasource">The datasource.</param>
/// <param name="userDataSourceId">The user data source identifier.</param>
/// <returns>
/// The integer value in the datasource or null if none is found.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Thrown when the value in the datasource cannot be converted to an integer.
/// </exception>
public static int?GetInt(this UserDataSources datasource, string userDataSourceId)
{
if (datasource.IsEmpty(userDataSourceId))
{
return(null);
}
string data = datasource.GetString(userDataSourceId);
int value;
var success = int.TryParse(data, NumberStyles.AllowLeadingSign, CultureInfo.InvariantCulture, out value);
if (success)
{
return(value);
}
throw new InvalidOperationException(FormatMessage(userDataSourceId, data, typeof(int?)));
}
public static DateTime?GetDateTime(this UserDataSources datasource, string userDataSourceId)
{
if (datasource.IsEmpty(userDataSourceId))
{
return(null);
}
var data = datasource.GetString(userDataSourceId);
DateTime value;
var success = DateTime.TryParse(data, CultureInfo.InvariantCulture, DateTimeStyles.None, out value);
if (success)
{
return(value);
}
throw new InvalidOperationException(FormatMessage(userDataSourceId, data, typeof(DateTime?)));
}
/// <summary>
/// Returns the double value in the datasource or null if none is found.
/// </summary>
/// <param name="datasource">The datasource.</param>
/// <param name="userDataSourceId">The user data source identifier.</param>
/// <returns>
/// The double value in the datasource or null if none is found.
/// </returns>
/// <exception cref="InvalidOperationException">
/// Thrown when the value in the datasource cannot be converted to a double.
/// </exception>
public static double? GetDouble(this UserDataSources datasource, string userDataSourceId)
{
if (datasource.IsEmpty(userDataSourceId))
{
return null;
}
string data = datasource.GetString(userDataSourceId);
double value;
var success = double.TryParse(data, NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign,
CultureInfo.InvariantCulture, out value);
if (success)
{
return value;
}
throw new InvalidOperationException(FormatMessage(userDataSourceId, data, typeof(double?)));
}
/// <summary>
/// Determines whether the specified user data source is empty.
/// </summary>
/// <param name="datasource">The datasource.</param>
/// <param name="userDataSourceId">The user data source identifier.</param>
/// <returns>True when empty, false otherwise.</returns>
private static bool IsEmpty(this UserDataSources datasource, string userDataSourceId)
{
string value = datasource.GetString(userDataSourceId);
return(string.IsNullOrEmpty(value));
}