isnullorempty – Tarik Billa

How to check whether all properties of an object are null or empty?

June 28, 2023 by Tarik

You can do it using Reflection bool IsAnyNullOrEmpty(object myObject) { foreach(PropertyInfo pi in myObject.GetType().GetProperties()) { if(pi.PropertyType == typeof(string)) { string value = (string)pi.GetValue(myObject); if(string.IsNullOrEmpty(value)) { return true; } } } return false; } Matthew Watson suggested an alternative using LINQ: return myObject.GetType().GetProperties() .Where(pi => pi.PropertyType == typeof(string)) .Select(pi => (string)pi.GetValue(myObject)) .Any(value => string.IsNullOrEmpty(value));

Check if string variable is null or empty, or full of white spaces

May 19, 2023 by Tarik

{% if your_variable is null or your_variable is empty %} should check whether the variable is null or empty. If you want to see if it’s not null or empty just use the notoperator. {% if foo is not null and foo is not empty %} See the docs: empty null “is” operator logical operators … Read more

‘IsNullOrWhitespace’ in JavaScript?

February 17, 2023 by Tarik

For a succinct modern cross-browser implementation, just do: function isNullOrWhitespace( input ) { return !input || !input.trim(); } Here’s the jsFiddle. Notes below. The currently accepted answer can be simplified to: function isNullOrWhitespace( input ) { return (typeof input === ‘undefined’ || input == null) || input.replace(/\s/g, ”).length < 1; } And leveraging falsiness, even … Read more

Does C# have IsNullOrEmpty for List/IEnumerable?

February 15, 2023 by Tarik

nothing baked into the framework, but it’s a pretty straight forward extension method. See here /// <summary> /// Determines whether the collection is null or contains no elements. /// </summary> /// <typeparam name=”T”>The IEnumerable type.</typeparam> /// <param name=”enumerable”>The enumerable, which may be null or empty.</param> /// <returns> /// <c>true</c> if the IEnumerable is null or … Read more

One liner for If string is not null or empty else

February 15, 2023 by Tarik

There is a null coalescing operator (??), but it would not handle empty strings. If you were only interested in dealing with null strings, you would use it like string output = somePossiblyNullString ?? “0”; For your need specifically, there is the conditional operator bool expr ? true_value : false_value that you can use to … Read more

How can I check whether a string variable is empty or null in C#? [duplicate]

December 3, 2022 by Tarik

if (string.IsNullOrEmpty(myString)) { // }

SQLite select where empty?

December 1, 2022 by Tarik

There are several ways, like: where some_column is null or some_column = ” or where ifnull(some_column, ”) = ” or where coalesce(some_column, ”) = ” of where ifnull(length(some_column), 0) = 0

Difference between IsNullOrEmpty and IsNullOrWhiteSpace in C# [duplicate]

October 22, 2022 by Tarik

Source: MSDN IsNullOrWhiteSpace is a convenience method that is similar to the following code, except that it offers superior performance: return String.IsNullOrEmpty(value) || value.Trim().Length == 0; White-space characters are defined by the Unicode standard. The IsNullOrWhiteSpace method interprets any character that returns a value of true when it is passed to the Char.IsWhiteSpace method as … Read more