'decimal'不包含'Round'的定义

Question

new to C# and hit this compile error when attempting to use the Round method for the first time. Any ideas? Thanks:

private void totalPoundsTextBox_TextChanged(object sender, TextChangedEventArgs e)
{
    TextBox textBox = textBoxes[1];
    decimal numericValue = textBoxNumberCheck(textBox, 0M, 22046M,false);
    if (numericValue >= 0)
        ***weight.Kilos =  decimal.Round(numericValue / 2.2046M, 2, MidpointRounding.AwayFromZero);***
        UpdateBoxValues();
}

Answer 1

I bet you have .Net Core project version prior to 2.0. Decimal.Round() method was missing in .Net Core prior to 2.0 but is now available. Check this issue for the details.

So you could fix your problem either by upgrading to .Net Core 2.0 or by using Math.Round() as Sunil suggests.

Answer 2

Use Math.Round instead:

private void totalPoundsTextBox_TextChanged(object sender, TextChangedEventArgs e)
{
    TextBox textBox = textBoxes[1];
    decimal numericValue = textBoxNumberCheck(textBox, 0M, 22046M,false);
    if (numericValue >= 0)
        weight.Kilos = Math.Round(numericValue / 2.2046M, 2, MidpointRounding.AwayFromZero);

    UpdateBoxValues();
}

Answer 3

请改用Math.Round。

weight.Kilos = Math.Round(numericValue / 2.2046, 2, MidpointRounding.AwayFromZero);