Question

.NET支持枚举的FlagsAttribute，表示“可以将枚举视为位字段”。

使用此[Flags]属性的枚举示例为System.Windows.Forms.Keys

这是我的Spring.NET对象定义：

<object id="command.paste" type="MyNamespace.PasteClipboardCommand, MyProject">
  <property name="Title" value="Paste into Folder" />
  <property name="ShortcutKeys" value="P" />
</object>

这会将Keys类型的ShortcutKeys设置为键P.没有问题。但是，由于这是一个快捷方式，我想指定像Control + P这样的快捷键。

如果我在代码中连接它，那将是：

command.ShortcutKeys = Keys.Control | Keys.P;

所以，也许我尝试这个有点天真：

<property name="ShortcutKeys" value="Control|P" />

这失败了，因为EnumConverter只能解析/转换单个枚举的字符串表示。完整的堆栈跟踪可在下面找到。

默认情况下Spring.NET可以吗？
我可以通过指定/使用其他EnumConverter来解决这个问题吗？
我应该创建/使用另一个Keys类来进行Spring.NET初始化吗？

更新

显然KeysConverter知道如何处理这个：

(new KeysConverter()).ConvertFrom(null, null, "Control+P");

不幸的是，EnumConverter不支持这个吗？

附加Stacktrace：

System.Configuration.ConfigurationErrorsException: Error creating context 'spring.root': PropertyAccessExceptionsException (1 errors); nested PropertyAccessExceptions are: 
[Spring.Core.TypeMismatchException: Cannot convert property value of type [System.String] to required type [System.Windows.Forms.Keys] for property 'ShortcutKeys'., Inner Exception: System.FormatException: Control|P is not a valid value for Keys. ---> System.ArgumentException: Requested value 'Control|P' was not found.
    at System.Enum.Parse(Type enumType, String value, Boolean ignoreCase)
    at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
    --- End of inner exception stack trace ---
    at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
    at System.ComponentModel.TypeConverter.ConvertFromInvariantString(String text)
    at Spring.Core.TypeConversion.TypeConversionUtils.ConvertValueIfNecessary(Type requiredType, Object newValue, String propertyName)] ---> Spring.Objects.Factory.ObjectCreationException: Error creating object with name 'command.builder.paste' defined in 'file [....\commands.xml] line 39' : Error setting property values: PropertyAccessExceptionsException (1 errors); nested PropertyAccessExceptions are: 
[Spring.Core.TypeMismatchException: Cannot convert property value of type [System.String] to required type [System.Windows.Forms.Keys] for property 'ShortcutKeys'., Inner Exception: System.FormatException: Control|P is not a valid value for Keys. ---> System.ArgumentException: Requested value 'Control|P' was not found.
    at System.Enum.Parse(Type enumType, String value, Boolean ignoreCase)
    at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
    --- End of inner exception stack trace ---
    at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
    at System.ComponentModel.TypeConverter.ConvertFromInvariantString(String text)
    at Spring.Core.TypeConversion.TypeConversionUtils.ConvertValueIfNecessary(Type requiredType, Object newValue, String propertyName)] ---> PropertyAccessExceptionsException (1 errors); nested PropertyAccessExceptions are: 
[Spring.Core.TypeMismatchException: Cannot convert property value of type [System.String] to required type [System.Windows.Forms.Keys] for property 'ShortcutKeys'., Inner Exception: System.FormatException: Control|P is not a valid value for Keys. ---> System.ArgumentException: Requested value 'Control|P' was not found.
    at System.Enum.Parse(Type enumType, String value, Boolean ignoreCase)
    at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
    --- End of inner exception stack trace ---
    at System.ComponentModel.EnumConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)
    at System.ComponentModel.TypeConverter.ConvertFromInvariantString(String text)
    at Spring.Core.TypeConversion.TypeConversionUtils.ConvertValueIfNecessary(Type requiredType, Object newValue, String propertyName)]

Answer 1

如果查看Spring.NET文档5.11 Configuration of IApplicationContext，您可以看到如何为给定类型添加特定类型转换器的示例。

在app.config中为类型键添加KeysConverter就足够了：

<converter for="System.Windows.Forms.Keys, System.Windows.Forms" type="System.Windows.Forms.KeysConverter, System.Windows.Forms"/>

现在可以像这样指定enumvalue /快捷方式：

<property name="ShortcutKeys" value="Control+P" />

Answer 2

尝试使用SpEL（Spring.NET表达式语言）： http://www.springframework.net/doc-latest/reference/html/expressions.html

<property name="ShortcutKeys" expression="Keys.Control or Keys.P" />

或

<property name="ShortcutKeys" expression="T(System.Windows.Forms.Keys).Control or T(System.Windows.Forms.Keys).P" />

Answer 3

<property name="ShortcutKeys" value="Control, P" />

如何在Spring.NET配置中为属性分配多个枚举值？

3 个答案: