String to null

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Home Java String Empty Null. Recent Post. Ace Spades Cool. Whole Foods Parmesan Crisps. It is because MessageBox. Show is implemented with pinvoke, it calls the native Windows MessageBox function. The C language has much stricter rules for pure. NET instance methods like ToString , it always emits code to verify that the object isn't null. There's some background info on that in this blog post. As this question ranks quite high on Google for a search for "c toString null", I would like to add that the Convert.

ToString null method would return an empty a null string, which is ignored by the messagebox. However, just to reaffirm the other answers, you can use string. Concat "string", null in this example. Edit - modified answer in line with HeyJude's comment below. As pointed out, a method like Convert.

ToString null. Length will throw an exception. You are trying to execute the ToString method on a null. You need a valid object in order to execute a method. Because, the second call is expecting an object of "s" to satisfy a ToString method request. Show is called, the s. ToString would failed with an attempt to call a method. Interestingly, While. Show is implemented correctly, many such methods expect non null instances to be passed in. Usually, that is when you use a NullObject pattern so that the caller should not have to deal with this kind of behavior.

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NullPointerException at com. String1 is null or empty String2 is null or empty. Perhaps it was in the Apache commons library. We allow users of our custom logging application to provide a "null" string in a property file, to express they actually mean null no value. Therefore in this case I need the solution to be case sensitive only allows lower case "null". Another situation I can think of which is not the case here is a web application where a client HTML input value "null" is expected to evaluate to null.

You will want a validator to notice invalid value null for a last name, where "null" would be accepted as a valid last name A third example is when you explicitly do not want your application to store the string "null" in a database's nullable var char field.