Does anyone know how to check for an unassigned string in uipath? Uipath seems to crash when an if statement looks for a null string. Not sure how to handle that. String.empty doesn't seem to work, and if the string is unassigned uipath stops logging and nothing happens.
There are many different approaches and ideas, but – according to me – what you can do is:
Always make sure before to define any variable by default, initialize it with empty strings(""). So it will be easy to check it with equal operator as well.
The Other approaches you can take in Uipath is based on .Net So u can use it's Is Nothing.
You can also use .Net String.IsNullOrEmpty Method (String) Method.
To check if a string variable is Null, you need to use either an If or Decision activity. The condition of those should be:
a is Nothing
This will return true if variable a is null and false otherwise
Best way to check string has value or not -->
These are some of the ways it can be checked.
1.
String.IsNullOrEmpty(yourString)
2.
yourString.Equals("")
3.
yourString.Equals(Nothing)
4.
yourString is Nothing
5.
String.IsNullOrWhiteSpace(yourString)
There are logical OR, AND and NOT to combine the different checks and they can clubbed together to check the best way to find out blank, null and whitespace string.
You can compare the string using:
Convert.ToString(DBNULL.Value)
We can check whether String is null with the following Syntax
String.IsNullOrWhiteSpace("Name_of_the_variable")
It will return boolean value
My suggestion is using the following method in UiPath
An If/Decision activity with the condition string.IsNullOrEmpty() making use of the IsNullOrEmpty() method
The best and easiest way will be the following:
String.IsNullOrWhiteSpace(stringVariableName)
Related
g.V(123).property('myProperty', myproperty? myProperty: null)
Here myProperty is of integer type and I wish to save an empty value for 'myProperty'.
I know null is not supported. Is there another alternative to achieve the same? (I can't save the value as 0 either)
As there is no notion of null in TinkerPop (for now) I'm afraid that you either have to remove the property or define some sort of constant to represent it. You say that you can't use "zero" but perhaps you could use something like Integer.MIN_VALUE or something? Or, if you are using a graph that doesn't have an explicit schema you could set it to a non-integer value like a "null" string? I can't reall think of any other workarounds.
First I use a "Get processes" activity which assigns its result to a variable called currentProcessesCollection which is of type Collection
Next I want to check this condition in and If activity currentProcessesCollection.Contains("OUTLOOK")
I'm getting 'string' cannot be converted to type System.Diagnostics.Process'
I'm kind of flummoxed by this and wondering if anyone knows some other way to do this. I was kind of hoping that writing out the problem would help, it didn't. Thanks for any help in advance. I need to find out if outlook is running.
As you correctly said, currentProcessCollection contains a collection of Process objects. As such, Contains requires another Process object in order to compare them, when you provided the string object "OUTLOOK.EXE".
If you want to search whether at least one process by name exists, just assign the following to a boolean variable (just replace Scan with any process name):
processCollection.Where(Function(x) x.ProcessName = "Scan").Count > 0
I have been struggling to return the count of courses from this XML file that contain "Cross-listed" as their description. The problem I encounter is because I am using for, it iterates and gives me "1 1" instead of "2". When I try using let instead I get 13 which means it counts all without condition even when I point return count($c["Cross-listed"]. What am I doing wrong and how can I fix it? Thanks in advance
for $c in doc("courses.xml")//Department/Course
where some $desc in $c/Description
satisfies contains($desc, "Cross-listed")
return count($c)
The problem I encounter is because I am using for
You are quite correct. You don't need to process items individually in order to count them.
You've made things much too difficult. You want
count(doc("courses.xml")//Department/Course[Description[contains(., "Cross-listed"]])
The key thing here is: you want a count, so call the count() function, and give it an argument which selects the set of things you want to include in the count.
My problem is that I can't get the IF condition to work in powerpivot (using DAX).
According to manual the syntax is:
IF(logical_test>,, value_if_false) where I can omitt the "value if false" if i want.
I have a lot of columns and I try to make a new one based on condition from another column.
What I tried is =IF([TimeTypeCode]="400", [WorkingHours]) and that doesn't work. What I want my condition to do is that if [TimeType] is equal to 400, then i want to put the value from [WorkingHours] in my new column. How can i do this?
from what I see here the problem is the ="400", the "" you used tell dax thats a string type and you are trying to use it as a numeric value.
Try using
IF([TimeTypeCode]=400, [WorkingHours])
instead,
Cheers!
I was reading the JMeter documentation and came across this info box about "If Controllers":
No variables are made available to the script when the condition is interpreted as Javascript. If you need access to such variables, then select "Interpret Condition as Variable Expression?" and use a __javaScript() function call. You can then use the objects "vars", "log", "ctx" etc. in the script.
I don't quite follow this. Does this mean if I want access to a "User Defined Parameter" then I can access it only by writing some JavaScript? The example that follows this box then refers to "${COUNT}"
Could someone clarify the usage of the If Controller, maybe with an example or two?
All these answers are wrong! You need to put the variable reference in quotes, like so:
"${my_variable}"=="foo"
You can simply use something like
${my_variable}=='1'
Sometimes JMeter documentation can be confusing :)
Edit 27 september 2017:
The answer here works but has a very bad performance impact when number of threads exceeds 40.
See below for correct and most performing answer:
https://stackoverflow.com/a/46976447/460802
See:
https://bz.apache.org/bugzilla/show_bug.cgi?id=61675
UNCHECK the CHECKBOX
"Interpret condition as variable expression"
I wasted a couple of hours without unchecking this checkbox. It worked with and without semicolon(;) at the end of the statement. Make sure that you have set the User-Defined Variables before calling the if controller.
All the following variations worked for me in Jakarta Jmeter 1.5
${__javaScript("${HOMEPAGE}"=="Y")}
${__javaScript("${HOMEPAGE}"=="Y")};
"${HOMEPAGE}"=="Y"
"${HOMEPAGE}"=="Y";
If Controller will internally use javascript to evaluate the condition but this can have a performance penalty.
A better option (default one starting from JMeter 4, see https://bz.apache.org/bugzilla/show_bug.cgi?id=61675) is to check "Interpret Condition as Variable Expression?", then in the condition field you have 2 options:
Option 1 : Use a variable that contains true or false. For example If you want to test if last sample was successful, you can use
${JMeterThread.last_sample_ok}
or any variable you want that contains true/false
${myVar}
Option 2 : Use a function (${__jexl3()} is advised) to evaluate an expression that must return true or false.
For example if COUNT is equal to 1:
${__jexl3("${COUNT}"== "1",)}
OR
${__jexl3(${COUNT}== 1,)}
Starting with 4.0, if you don't use the "Interpret Condition as Variable Expression?", a warning in RED will be displayed:
If you'd like to learn more about JMeter and performance testing this book can help you.
God bless the http://habrahabr.ru
Have tried until found these.
Using the quotes was my solution.
As Gerrie said you need to check your variable
${my_var} == 'value'
But be careful with the 'User Defined Variables'
Note that all the UDV elements in a
test plan - no matter where they are -
are processed at the start.
That basically means that you cannot define 'User Defined Variables' inside an 'If Controller'. Take a look to the 'BeanShell' instead.
Replace:
${my_variable}=='1'
with
"${my_variable}" == "1"
if it's string value pass as below and its performance effective
${__groovy("${key}"=="value")}
I have used ${code_g1}== 200 in condition and it worked for me.