Example 2: Check if String with spaces is Empty or Null class Main { public static void main(String[] args) { // create a string with white spaces String str = " "; // check if str1 is null or empty System.out.println("str is " + isNullEmpty(str)); } // method check if ...
Check if a string is null or empty in XSLT 多条件查询 string.Format("/root/deviceList//item/guid[{0}]", strBuilder.ToString()) "/root/deviceList//item/guid[text()=\"h\" or text()=\"a\" or text()=\"c\"]"谓词嵌套var nodes = xmlDoc.SelectNodes(string.Format("/root/device...
NavController'. If the controller doesn't have a controller factory, ensure that it has a parameterless public constructor. An error occurred while executing the command definition. See the inner exception for details. An exception of type 'System.NullReferenceException' occurred in App_Web_nw441zq...
I know that below are the two ways in JavaScript to check whether a variable is notnull, but I’m confused which is the best practice to use. Should I do: if(myVar) {...} or if(myVar !==null) {...} 回答1 They are not equivalent. The first will execute the block following th...
1)Since you tell me that some of values of ParentId is null, some are not. How a basic type int contains null value? I don't think so. I'm afraid you'd better use int? instead of int. Or pleasse tell me what value in fact does the int contain if it's null?
This should work if i correctly understand what you want to do. The formula is in cell H2 in the attached sample file and filled down. If there are two or more matches for the search criteria in columns E and G of Sheet1 the formula spills the results to the ri...
[] checkboxes =newCheckBox[] { pepperoniCheckbox, beefCheckbox, mushroomsCheckbox, onionsCheckbox };foreach(CheckBox cincheckboxes) {if(c.IsChecked ==true) {if(selectedToppingsText.Length >1) { selectedToppingsText +=", "; } selectedToppingsText += c.Content; } } toppingsList.Text = ...
Get the nameAvailable property: Value indicating Namespace is availability, true if the Namespace is available; otherwise, false. Returns: the nameAvailable value.reason public UnavailableReason reason() Get the reason property: The reason for unavailability of a Namespace. Returns...
If no hint can be provided, or the hint is self-evident from the error message, the hint can be omitted, or a value of None can be used. obj Optional. An object providing context for the message (for example, the model where the problem was discovered). The object should be a ...
Check if a file exists in vb.net. check if a querystring exists? Check if a value exist in Dropdown List Items Check if any DropDownList values have changed Check if arraylist is empty check if email is sent check if input is integer or string Check if linq result is null. check if ...