确定在C#中设置了哪个'oneof' proto3字段
Determine which 'oneof' proto3 field is set in C#
对于下面的Protocol Buffer message (proto3) 我如何确定设置的是哪种类型？似乎没有像生成的 C++ 版本那样的 "has_reply" 方法。
message Event {
oneof type {
Connection connection = 1;
StatusReply reply = 2;
Error error = 3;
End end = 4;
Empty empty = 5;
};
}
https://developers.google.com/protocol-buffers/docs/reference/csharp-generated#oneof建议TypeOneofCase会告诉你设置的是：
Oneof Fields
Each field within a oneof has a separate property, like a regular
singular field. However, the compiler also generates an additional
property to determine which field in the enum has been set, along with
an enum and a method to clear the oneof. For example, for this oneof
field definition
oneof avatar {
string image_url = 1;
bytes image_data = 2;
}
The compiler will generate these public members:
enum AvatarOneofCase
{
None = 0,
ImageUrl = 1,
ImageData = 2
}
public AvatarOneofCase AvatarCase { get; }
public void ClearAvatar();
public string ImageUrl { get; set; }
public ByteString ImageData { get; set; }
If a property is the current oneof "case", fetching that property will
return the value set for that property. Otherwise, fetching the
property will return the default value for the property's type - only
one member of a oneof can be set at a time.
Setting any constituent property of the oneof will change the reported
"case" of the oneof. As with a regular singular field, you cannot set
a oneof field with a string or bytes type to a null value. Setting a
message-type field to null is equivalent to calling the oneof-specific
Clear method.
对于下面的Protocol Buffer message (proto3) 我如何确定设置的是哪种类型？似乎没有像生成的 C++ 版本那样的 "has_reply" 方法。
message Event {
oneof type {
Connection connection = 1;
StatusReply reply = 2;
Error error = 3;
End end = 4;
Empty empty = 5;
};
}
https://developers.google.com/protocol-buffers/docs/reference/csharp-generated#oneof建议TypeOneofCase会告诉你设置的是：
Oneof Fields
Each field within a oneof has a separate property, like a regular singular field. However, the compiler also generates an additional property to determine which field in the enum has been set, along with an enum and a method to clear the oneof. For example, for this oneof field definition
oneof avatar { string image_url = 1; bytes image_data = 2; }The compiler will generate these public members:
enum AvatarOneofCase { None = 0, ImageUrl = 1, ImageData = 2 } public AvatarOneofCase AvatarCase { get; } public void ClearAvatar(); public string ImageUrl { get; set; } public ByteString ImageData { get; set; }If a property is the current oneof "case", fetching that property will return the value set for that property. Otherwise, fetching the property will return the default value for the property's type - only one member of a oneof can be set at a time.
Setting any constituent property of the oneof will change the reported "case" of the oneof. As with a regular singular field, you cannot set a oneof field with a string or bytes type to a null value. Setting a message-type field to null is equivalent to calling the oneof-specific Clear method.