|
public static ResolveActualType ( |
||
| type | The type to resolve. | |
| Результат | ||
/// <summary>
/// Determines whether this type converter can convert values for the specified type.
/// </summary>
/// <param name="type">The type to check.</param>
/// <returns>
/// <c>true</c> if this instance can convert the specified type; otherwise, <c>false</c>.
/// </returns>
public bool CanConvert(Type type)
{
if (type != null && type.IsEnum)
{
return(true);
}
var actualType = TypeConverter.ResolveActualType(type);
return(actualType != null ? actualType.IsEnum : false);
}
/// <summary>
/// Determines whether this type converter can convert values for the specified type.
/// </summary>
/// <param name="type">The type to check.</param>
/// <returns>
/// <c>true</c> if this instance can convert the specified type; otherwise, <c>false</c>.
/// </returns>
public bool CanConvert(Type type)
{
if (type != null && type.IsEnum)
{
return(true);
}
Type actualType = TypeConverter.ResolveActualType(type);
return(actualType?.IsEnum == true);
}
/// <summary>
/// Converts the specified value into an instance of the database value.
/// </summary>
/// <param name="value">The value to be converted.</param>
/// <param name="type">The type to convert from.</param>
/// <returns>An instance of the corresponding database type containing the value.</returns>
public object ConvertToDbValue(object value, Type type)
{
if (value == null)
{
return(value);
}
var enumType = TypeConverter.ResolveActualType(type);
var enumStorageType = Enum.GetUnderlyingType(enumType);
var underlyingValue = Convert.ChangeType(value, enumStorageType, CultureInfo.InvariantCulture);
return(underlyingValue);
}
/// <summary>
/// Converts value at the specified index in the IDataReader into an instance of the specified type.
/// </summary>
/// <param name="reader">The IDataReader containing the results.</param>
/// <param name="index">The index of the record to read from the IDataReader.</param>
/// <param name="type">The type to convert result value to.</param>
/// <returns>An instance of the specified type containing the specified value.</returns>
public object ConvertFromDbValue(IDataReader reader, int index, Type type)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if (type == null)
{
throw new ArgumentNullException("type");
}
if (reader.IsDBNull(index))
{
return(null);
}
object enumValue;
var enumType = TypeConverter.ResolveActualType(type);
var enumStorageType = Enum.GetUnderlyingType(enumType);
switch (enumStorageType.Name)
{
case "Byte":
enumValue = Enum.ToObject(enumType, reader.GetByte(index));
break;
case "Int16":
enumValue = Enum.ToObject(enumType, reader.GetInt16(index));
break;
case "Int32":
enumValue = Enum.ToObject(enumType, reader.GetInt32(index));
break;
case "Int64":
enumValue = Enum.ToObject(enumType, reader.GetInt64(index));
break;
default:
enumValue = Enum.ToObject(enumType, reader[0]);
break;
}
return(enumValue);
}
/// <summary>
/// Converts the specified database value into an instance of the specified type.
/// </summary>
/// <param name="value">The database value to be converted.</param>
/// <param name="type">The type to convert to.</param>
/// <returns>An instance of the specified type containing the specified value.</returns>
public object ConvertFromDbValue(object value, Type type)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
if (value == null || value == DBNull.Value)
{
return(null);
}
var enumType = TypeConverter.ResolveActualType(type);
var enumStorageType = Enum.GetUnderlyingType(enumType);
var underlyingValue = Convert.ChangeType(value, enumStorageType, CultureInfo.InvariantCulture);
var enumValue = Enum.ToObject(enumType, underlyingValue);
return(enumValue);
}