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One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.许朝光大喝道：废话少说。她便笑着上前帮山芋拢了拢头发The parameter object sender in DoSth is usually used to represent the initiator of the action, and EventArgs e is used to represent the parameters taken by the action.2. At this moment, you will see that there is an optional "Original Image" option at the bottom of the screen. Click and then transmit it to be a clear original image.都说好了伤疤忘了疼，他手上的伤疤还没好哩，还缠着布哩，哪能就忘记了。3. Is the emergency response effective