How to Split a Single Command-Line Parameter String into a String Array in C#?

Split the command line parameter string into a string array in C#

Problem Overview

In C#, command line arguments are passed as string arrays string[]. The question is how to extract this array from a single string containing command line parameters?

Use standard functions or regular expressions?

There is no directly available standard function to accomplish this task. However, we can use custom functions or regular expressions to split the string correctly.

Custom function based on character check

Strings can be split using custom functions based on character checks. This function examines each character and determines whether the string should be split. The function form is as follows:

<code class="language-csharp">public static IEnumerable<string> SplitCommandLine(string commandLine)
// ...</code>

Segmentation Algorithm

The algorithm is as follows:

1. Initializes a variable inQuotes to false.
2. Split the string using a function that determines the split point as follows:
   • Toggle the value of inQuotes if the character is '"'.
   • Split the string if inQuotes is false and the character is ' '.
3. Trim and remove matching quotes in split strings.
4. Filter out any empty strings.

Extension methods

Functionality can be extended using the following extension methods:

• public static IEnumerable<string> Split(this string str)
• public static string TrimMatchingQuotes(this string input, char quote)

Usage examples

To use this function, provide a single string containing the command line arguments and receive an string[] array containing the individual arguments:

<code class="language-csharp">string[] parameterArray = SplitCommandLine(parameterString).ToArray();</code>

Custom Test

<code class="language-csharp">public static void Test(string cmdLine, params string[] args)
// ...</code>

Custom tests can be used to verify the accuracy of the segmentation algorithm. This function compares the split array with the expected array and asserts that they are equal.

Conclusion

By using a custom function or regular expression, we can effectively split the string containing the command line parameters into an string[] array, capturing the individual parameters, just like how C# does when specifying parameters on the command line .

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