/// <summary>
/// Tries to return a value of <see cref="WorkflowBase.Vars" /> property strong typed.
/// </summary>
/// <typeparam name="T">Target type.</typeparam>
/// <param name="name">The name of the var.</param>
/// <param name="value">The field where to write the found value to.</param>
/// <param name="defaultValueProvider">
/// The logic that produces the default value for <paramref name="name" />
/// if <paramref name="value" /> does not exist.
/// </param>
/// <returns>Var exists or not.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="defaultValueProvider" /> is <see langword="null" />.
/// </exception>
public bool TryGetVar <T>(IEnumerable <char> name, out T value, Func <string, T> defaultValueProvider)
{
if (defaultValueProvider == null)
{
throw new ArgumentNullException("defaultValueProvider");
}
lock (this.SyncRoot)
{
IDictionary <string, object> dict = this.Vars;
if (dict != null)
{
object foundValue;
if (dict.TryGetValue(SimpleWorkflowExecutionContext.ParseVarName(name), out foundValue))
{
value = GlobalConverter.Current
.ChangeType <T>(foundValue);
return(true);
}
}
}
value = defaultValueProvider(StringHelper.AsString(name));
return(false);
}
/// <summary>
/// Gets or sets a value of the variables of that workflow.
/// </summary>
/// <param name="name">The name of the var.</param>
/// <returns>The value of the var.</returns>
/// <remarks>
/// The variable names are NOT case sensitive.
/// </remarks>
public object this[IEnumerable <char> name]
{
get { return(this.Vars[SimpleWorkflowExecutionContext.ParseVarName(name)]); }
set { this.Vars[SimpleWorkflowExecutionContext.ParseVarName(name)] = value; }
}
