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Casual Articles - Visual C# Express - Parsing User Input (4th In A Series)
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Nearly every numeric data type has a Parse function which operates on a string and converts it to a numeric data type. For exampl
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TextBox Accepts only Strings
There are four user input text boxes in the CompoundGrowth form of the InterestCalculator program, and all of them APPEAR to accept numeric; but in fact they do not. They all accept strings, for one simple reason. Strings are the only data accepted by the .net TextBox control. In fact the only way to read the contents of the TextBox control is via the "Text" property, which returns a string.
Parse Function to the Rescue
Since the Textbox control accepts only strings, the programmer is stuck with the problem of converting from a C# string type to a C# numeric type. There are in fact several methods for doing this using the .net class library, but in this article I will show you how to do it using the Parse function.
Nearly every numeric data type has a Parse function which operates on a string and converts it to a numeric data type. For example
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TextBox Accepts only Strings
There are four user input text boxes in the CompoundGrowth form of the InterestCalculator program, and all of them APPEAR to accept numeric; but in fact they do not. They all accept strings, for one simple reason. Strings are the only data accepted by the .net TextBox control. In fact the only way to read the contents of the TextBox control is via the "Text" property, which returns a string.
Parse Function to the Rescue
Since the Textbox control accepts only strings, the programmer is stuck with the problem of converting from a C# string type to a C# numeric type. There are in fact several methods for doing this using the .net class library, but in this article I will show you how to do it using the Parse function.
Nearly every numeric data type has a Parse function which operates on a string and converts it to a numeric data type. For exampl
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Parse Function to the Rescue
Since the Textbox control accepts only strings, the programmer is stuck with the problem of converting from a C# string type to a C# numeric type. There are in fact several methods for doing this using the .net class library, but in this article I will show you how to do it using the Parse function.
Nearly every numeric data type has a Parse function which operates on a string and converts it to a numeric data type. For exampl
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Parse Function to the Rescue
Since the Textbox control accepts only strings, the programmer is stuck with the problem of converting from a C# string type to a C# numeric type. There are in fact several methods for doing this using the .net class library, but in this article I will show you how to do it using the Parse function.
Nearly every numeric data type has a Parse function which operates on a string and converts it to a numeric data type. For exampl
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Nearly every numeric data type has a Parse function which operates on a string and converts it to a numeric data type. For example, the code to convert from a string to a double would look something like the following:
// Convert string in txtPrincipal TextBox to a double precision number mPrincipal= Double.Parse( txtPrincipal.Text);
That's all there is to it . . . except for one small problem. What happens when if someone types something like "1A3Y" into the txtPrincipal TextBox? Now we have a problem.
Recovering from Erroneous Inputs
It would easy to design forms if people always hit the right buttons and always entered the correct data. The challenge of designing and coding forms is to give them reasonable error recovery scenarios.
The .net class library supports a solution to the problem detecting and handling erroneous input. In addition to the Parse function there is a TryParse function associated with each numeric data type. The TryParse function does just what you would think, it tries to parse a text string and returns boolean true if
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