1. Difference
Both textbox.Text = "" and textbox.Clear() can be used to clear the contents of a text box, but there are some subtle differences between them.
textbox.Text = "": This method will directly set the Text property of the text box to an empty string. This immediately clears the contents of the text box and displays the text box as empty. This operation is synchronous and does not cause delays. However, it should be noted that if you use binding or other methods to set the value of the text box, this method may not trigger the corresponding event or update of the binding.
textbox.Clear(): This method uses the Clear() method to clear the contents of the text box. The Clear() method clears all text in the text box and displays the text box as empty. Compared with textbox.Text = "", the Clear() method is more intuitive and does not affect other text box-related properties or events when clearing the text box content.
If you simply clear the contents of the text box, both methods can be used. If you want a more intuitive and concise way to clear the text box, and do not need to consider the impact of other properties or events, then it is recommended to use the textbox.Clear() method.
Strictly speaking, textbox.text="" is more resource-efficient than textbox.clear(), because it only cares about characters, while clear has other reset tasks. But this difference is very small. Just like when you eat, eating one grain of rice or eating two grains of rice, how much impact will it have on your stomach (computer)?
2. Ghosting
Using textBox1.text="" in thread asynchronously will not clear all characters at once, especially in the case of multiple lines. If another method uses asynchronous writing again, you will find that only the first few characters seem to be cleared. lines, the following lines seem to be the effect of characters being continuously overwritten and written, a bit of a ghosting effect. The txtbox.text="" is used synchronously below, and clear() is used in others. Compare the effects:
When there are results, when using synchronization (using textbox1.text="") to append characters one by one, there seems to be ghosting. The reason is the delay.
The delay is caused by asynchronous processing between the UI thread and the operation of updating the text box.
In UI applications, the UI thread is responsible for handling user interactions and interface updates. When you use txtInfo.Text = "" to set the Text property of the text box to an empty string, the operation of updating the text box is actually added to the message queue of the UI thread, waiting for processing by the UI thread.
However, while the UI thread is processing the message queue, there may be other tasks or operations in progress, such as updating other controls, responding to user input, etc. These tasks may occupy the UI thread's time, causing the operation of updating the text box to be delayed.
Therefore, during the delay, you may see the effect of the text box covering the string one by one, as part of the text is cleared and then new text is gradually filled in. This is because clearing the text and displaying the new text are separate operations that are performed sequentially on the UI thread.
In order to avoid delays, you can use the txtInfo.Clear() method, which will directly clear the contents of the text box without waiting for the UI thread to process the message queue. This clears all text content at once without overwriting it one by one.