I need to convert a string data from byte to float-CodePudding

I have a text box and I need to convert the value I entered.

and in the end i guess i need to convert Double into a data.

but there is something wrong example code:

textbox1.Text = "24.5";
double data = int.Parse(textbox1.Text);

byte[] b = BitConverter.GetBytes((data)f);
int i = BitConverter.ToInt32(b, 0);

code working like this

byte[] b = BitConverter.GetBytes(22.3f);
int i = BitConverter.ToInt32(b, 0);

how can i insert string data ?

CodePudding user response：

int.Parse() is wrong and will likely throw an exception. If you have the string value "24.5", what do you expect an integer to do with the ".5" portion?

Try this:

textbox1.Text = "24.5";
double data = double.Parse(textbox1.Text);

Even better if you use one of the double.TryParse() overloads.

CodePudding user response：

I don't think you can write

byte[] b = BitConverter.GetBytes((data)f);

(data)f -> is not valid. I think you wanted to use it like 24.5f. Try to cast it into float. For example:

byte[] b = BitConverter.GetBytes((float) data);

Furthermore why would you parse a string as an int into a double? Parse the string directly as double.

Look at @Joel Coehoorn comment. For more information about Double.TryParse() look at: Microsofts handbook about Double.TryParse