//
/// <summary>
/// Creates a new <see cref="ModelMappingDictionary"/> for an object model type.
/// </summary>
/// <param name="modelType">The type of object model to read property mappings from.</param>
/// <returns>A new, filled instance.</returns>
public static ModelMappingDictionary CreateFrom(Type modelType)
{
if (modelType == null)
{
throw new ArgumentNullException(nameof(modelType));
}
var modelMappingDictionary = new ModelMappingDictionary(modelType);
foreach (var mapping in GetModelMappingsForPropertiesOfType(modelType))
{
modelMappingDictionary.Add(mapping.SourceKeyName, mapping);
}
return(modelMappingDictionary);
}
/// <summary>
/// Reads the current appSettings section into a new instance of the model class type specified.
/// </summary>
/// <param name="modelType">Type of the model.</param>
/// <param name="errors">When an errors collection is supplied, then throwing is suppressed and instead the errors collection is populated.</param>
/// <returns>
/// An instance of the type specified.
/// </returns>
/// <exception cref="ArgumentNullException">modelType</exception>
/// <exception cref="Evoq.Configuration.InvalidConfigurationModelException">
/// </exception>
/// <exception cref="InvalidConfigurationModelException"></exception>
public object ReadInto(Type modelType, ICollection <ConfigurationModelValidationError> errors)
{
if (modelType == null)
{
throw new ArgumentNullException(nameof(modelType));
}
bool throwOnValidationErrors = (errors == null); // If we were not supplied with a bucket in which to stick errors, we must throw.
var modelMappings = ModelMappingDictionary.CreateFrom(modelType);
if (modelMappings.Any())
{
object model;
model = this.CreateModelInstanceOrThrow(modelType);
foreach (var mapping in modelMappings.Values)
{
try
{
// SetValue will throw given the wrong type for the model property.
object sourceValue = this.GetSourceValue(mapping);
mapping.PropertyInfo.SetValue(model, sourceValue);
}
catch (InvalidOperationException notValidException) when(notValidException.Message.Contains("not a valid"))
{
// Invalid type cast/convert.
if (throwOnValidationErrors)
{
throw new InvalidConfigurationModelException($"Cannot read the settings into {modelType.Name}.{mapping.ModelPropertyName}. {notValidException.Message}", notValidException);
}
else
{
errors.Add(new ConfigurationModelValidationError(notValidException.Message, new string[] { mapping.ModelPropertyName }));
}
}
catch (KeyNotFoundException)
{
// Missing. We can swallow the problem here and allow later validation step to deal with it.
}
catch (InvalidOperationException)
{
// Missing. We can swallow the problem here and allow later validation step to deal with it.
}
}
IEnumerable <ConfigurationModelValidationError> validationErrors = null;
bool isValid = this.ModelValidator.TryValidateModel(model, out validationErrors);
if (!isValid)
{
// Invalid.
if (throwOnValidationErrors)
{
string message;
if (validationErrors.Count() == 1)
{
message = $"Cannot read the settings into {modelType.Name}. {validationErrors.First().ErrorMessage}";
}
else
{
message = $"Cannot read the settings into {modelType.Name}. There are {validationErrors.Count()} validation errors.";
}
throw new InvalidConfigurationModelException(message)
{
ValidationErrors = validationErrors
};
}
else
{
foreach (var error in validationErrors)
{
errors.Add(error);
}
}
}
return(model);
}
else
{
throw new InvalidConfigurationModelException($"Cannot read the appSettings section. The model class {modelType.Name} has no public properties.");
}
}