converters | 易学教程

When will the ValueConverter's Convert method be called in wpf

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问题 I have an ObservableCollection bound to a list box and a boolean property bound to a button . I then defined two converters , one that operates on the collection and the other operates on the boolean property. Whenever I modify the boolean property, the converter's Convert method is called, where as the same is not called if I modify the observable collection. What am I missing?? Snippets for your reference, xaml snipet, <Window.Resources> <local:WrapPanelWidthConverter x:Key=

How to convert an int value to string in Go?

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i := 123 s := string(i) s is 'E', but what I want is "123" Please tell me how can I get "123". And in Java, I can do in this way: String s = "ab" + "c" // s is "abc" how can I concat two strings in Go? Use the strconv package's Itoa function. For example: package main import ( "strconv" "fmt" ) func main() { t := strconv.Itoa(123) fmt.Println(t) } You can concat strings simply by + 'ing them, or by using the Join function of the strings package. fmt.Sprintf("%v",value); If you know the specific type of value use the corresponding formatter for example %d for int More info - fmt kgthegreat It

Using Value Converters in WPF without having to define them as resources first

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问题 Is it possible to use value converters without having to define them beforehand as resources? Right now I have <Window.Resources> <local:TrivialFormatter x:Key="trivialFormatter" /> </Window.Resources> and <Button Width="{Binding Width, ElementName=textBox1, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource trivialFormatter}}"> Wouldn't it be possible that instead of having to declare the trivialFormatter resource in Window.Resources, I could directly refer it from the Button's

std::string to SecByteBlock conversion

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问题 I'm currently writing blowfish encryption/decryprion program in C++ (using crypto++). I really didn't find a satisfied answer at google. I'm trying to send a key of a SecByteBlock as a string and then received in the other part as string then need to be regained to SecByteBlock. Is it possible to convert string <--> SecByteBlock Can I do something better to send key from one function to another? Thank you for help in advance. The code I use is the following: int main(int argc, char* argv[]) {

Encoding conversion in java

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Is there any free java library which I can use to convert string in one encoding to other encoding, something like iconv ? I'm using Java version 1.3. Jon Skeet You don't need a library beyond the standard one - just use Charset . (You can just use the String constructors and getBytes methods, but personally I don't like just working with the names of character encodings. Too much room for typos.) EDIT: As pointed out in comments, you can still use Charset instances but have the ease of use of the String methods: new String(bytes, charset) and String.getBytes(charset) . See " URL Encoding (or:

Encoding conversion in java

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问题 Is there any free java library which I can use to convert string in one encoding to other encoding, something like iconv? I\'m using Java version 1.3. 回答1: You don't need a library beyond the standard one - just use Charset. (You can just use the String constructors and getBytes methods, but personally I don't like just working with the names of character encodings. Too much room for typos.) EDIT: As pointed out in comments, you can still use Charset instances but have the ease of use of the

Correct way to convert size in bytes to KB, MB, GB in JavaScript

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问题 I got this code to covert size in bytes via PHP. Now I want to convert those sizes to human readable sizes using JavaScript. I tried to convert this code to JavaScript, which looks like this: function formatSizeUnits(bytes){ if (bytes >= 1073741824) { bytes = (bytes / 1073741824).toFixed(2) + \" GB\"; } else if (bytes >= 1048576) { bytes = (bytes / 1048576).toFixed(2) + \" MB\"; } else if (bytes >= 1024) { bytes = (bytes / 1024).toFixed(2) + \" KB\"; } else if (bytes > 1) { bytes = bytes + \"