Where can I get the syntax, is there a comparison table? How do you do it?

Question

Sample

IsValid callback;   // define a variable of delegate type IsValid
callback = s => s?.Length > 1;   // using lambda, define a callback function
var result = callback("test");   // invoke the callback code

IsValid callbackDelegateVariant2;
callbackDelegateVariant2 = Variant2_WriteWithDelegate;
var resultVariant2Delegate = callbackDelegateVariant2("test Variante2 withe delegate");   // invoke the callback code

private bool Variant2_WriteWithDelegate(string s)
{
	Trace.WriteLine(s);
	return s.Length > 1;
}

How do I come up with this spelling, what is the best way to go about it? Variant2 is clear.

var query = currentMappingTable.Labels.Label.Join(currentMappingTable.ParametersLabels.ParameterLabel, label => label.Id, parameter => parameter.FKParameter,
           (label, parameter) => new { label, parameter }).Join(currentMappingTable.Parameters.Parameter, label => label.parameter.FKLabel).where

Sometimes you can find (x,y) spellings. How do I find the correct syntax? Is there any good help? The advantage will be shorter spelling? Is that the case?

Answer 1

Hi @Noah Aas , Welcome to Microsoft Q&A,

To get the correct syntax for lambda expressions and LINQ queries in C#, you can refer to the official documentation or use code samples as references. Here are some resources where you can find syntax and examples:

1. Official Microsoft Documentation:
   • Lambda Expressions (C# Programming Guide)
   • LINQ (Language-Integrated Query) (C#)
2. Online Tutorials and Blogs
3. Books
4. Development Environments:
   • IDEs like Visual Studio offer IntelliSense, which provides suggestions and autocompletion for syntax as you type.

In C#, the (x, y) syntax you're referring to is called a lambda expression. It's a concise way to represent an anonymous function that can have one or more parameters. The syntax (x, y) => expression is used to define a lambda expression with parameters x and y.

1. Use descriptive names: Name your methods and variables according to what they do or represent.
2. Use camelCase for method names and local variables: This is a common convention in C#.
3. Avoid abbreviations unless they're very common and won't confuse other developers.
4. Be consistent: Once you choose a naming convention, stick to it.

Best Regards,

Jiale

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