Checking String null or empty (including empty spaces)

Aspose.Words Product Family
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1

Hi team,

I have a string variable that I need to fill as dynamic value in the Aspose Words template.
Is there a way to check if the variable (string) is not null or empty? Just like we do have methods in .

Or if we can create a function that we can reuse in the Words template?

I am using Linq reporting Engine and Aspose words.

2

@Ashutosh_Tripathi

To check if a string variable is null or empty in an Aspose Words template using the LINQ Reporting Engine, you can create a custom function that can be reused throughout your template. Unfortunately, there isn’t a built-in method specifically for this check, but you can define a function in your code that can be called from the template.

Here’s a simple example of how you can implement this:

  1. Create a function in your code that checks if a string is null or empty:

    public static bool IsNullOrEmpty(string value)
{
    return string.IsNullOrEmpty(value);
}

  2. Register this function with the LINQ Reporting Engine:

    var engine = new ReportingEngine();
engine.AddFunction("IsNullOrEmpty", new Func<string, bool>(IsNullOrEmpty));

  3. Use the function in your template like this:

    {{#if IsNullOrEmpty(yourVariable)}}
    The variable is null or empty.
{{else}}
    The variable has a value: {{yourVariable}}.
{{/if}}

This approach allows you to check for null or empty strings dynamically within your Aspose Words template, making your reporting more flexible and robust.

If you need further assistance or examples, feel free to ask!

3

Thanks for the quick response.
I will try this out. Just couple of more questions.

  1. Can we add multiple helper functions like this and use them in our template? Meaning can we use the AddFunction Multiple times to add multiple utility functions like this?
  2. I would also be interested in knowing how can we achieve this in template alone? Meaning if I don’t want to make any changes in the template how can we check for null or empty string in the word template?

Thanks in advance!

4

I just tried the approach you mentioned.
I couldn’t find the AddFunction in the ReportingEngine class. Can you help me with the package & namespace name for the same?

6

@Ashutosh_Tripathi The code provided by the bot has a mistake. But you can achieve what you need by adding a known type, like described in the documentation:
https://docs.aspose.com/words/net/setting-up-known-external-types/