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Flutter – How to initialize Future List DataRow

I need to initialize

Future<List<DataRow>> myrow = [];

I need to construct a table based on a future list.

Right now, I get the message:

A value of type ‘List’ can’t be assigned to a variable of type ‘Future<List>’

Thank you

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3

Answers


  1. 0

    The error occurs because Future<List<DataRow>> expects a future (an asynchronous value) rather than a direct list. To initialize it properly, you need to assign a future or use an asynchronous function to fetch or construct the data

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  2. 0

    When you got a function that return a Future<List>, this mean two things:

    First, the function is asynchronous and may not return immediately ans second the type of the return value is List.

    So if you have a function prototype like this one:

    Future<List<DataRow>> myFunction() { ... }

    you have to get the return value to do this:

    List<DataRow> myrow = [];
myrow = await myFunction();

    The await keyword instruct to wait for myFunction return.

    You can also use .then in order to wait myFunction completion :

    myFunction()
.then((value) => {
    myrow = value; // In this case value type is List<DataRow>
});
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  3. 0 
    Future<List<DataRow>> myrow = Future.value([]);
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