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CM-235: Difference between int.Parse() and Convert.ToInt32 in C# (#197)
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‎csharp-basic-topics/IntParseVsConvertToInt/IntParseVsConvertToInt.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.0.31919.166
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IntParseVsConvertToInt", "IntParseVsConvertToInt\IntParseVsConvertToInt.csproj", "{2DA8495D-1230-4BA9-9E68-B16B6A9F3743}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tests", "Tests\Tests.csproj", "{BF213CC4-67F1-46BF-AC07-5FE38FA9A234}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{2DA8495D-1230-4BA9-9E68-B16B6A9F3743}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{2DA8495D-1230-4BA9-9E68-B16B6A9F3743}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{2DA8495D-1230-4BA9-9E68-B16B6A9F3743}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{2DA8495D-1230-4BA9-9E68-B16B6A9F3743}.Release|Any CPU.Build.0 = Release|Any CPU
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{BF213CC4-67F1-46BF-AC07-5FE38FA9A234}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{BF213CC4-67F1-46BF-AC07-5FE38FA9A234}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{BF213CC4-67F1-46BF-AC07-5FE38FA9A234}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{BF213CC4-67F1-46BF-AC07-5FE38FA9A234}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {7066FD66-2D00-4284-8731-2EDDC3A70AC7}
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EndGlobalSection
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EndGlobal

‎csharp-basic-topics/IntParseVsConvertToInt/IntParseVsConvertToInt/IntParseVsConvertToInt.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net6.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>

‎csharp-basic-topics/IntParseVsConvertToInt/IntParseVsConvertToInt/Program.cs

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namespace IntParseVsConvertToInt
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{
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public class Program
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{
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public static void IntParseMethod(string inputString)
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{
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try
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{
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var outputInteger = int.Parse(inputString);
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Console.WriteLine(outputInteger);
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}
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catch (ArgumentNullException ex)
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{
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Console.WriteLine("The int.Parse() method throws ArgumentNullException.");
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}
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}
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public static void ConvertToInt32Method(string inputString)
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{
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var outputInteger = Convert.ToInt32(inputString);
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Console.WriteLine(outputInteger);
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}
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public static void IntTryParseMethod(string inputString)
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{
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if (int.TryParse(inputString, out var outputInteger))
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Console.WriteLine($"Output value: {outputInteger}");
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else
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Console.WriteLine("The conversion failed.");
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}
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public static void Main(string[] args)
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{
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var inputString = " 123 ";
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string inputNullString = null;
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IntParseMethod(inputString);
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IntParseMethod(inputNullString);
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Console.WriteLine();
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ConvertToInt32Method(inputString);
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ConvertToInt32Method(inputNullString);
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Console.WriteLine();
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IntTryParseMethod(inputString);
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IntTryParseMethod(inputNullString);
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}
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}
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}

‎csharp-basic-topics/IntParseVsConvertToInt/Tests/IntParseVsConvertToIntUnitTest.cs

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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using System;
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namespace Tests
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{
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[TestClass]
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public class IntParseVsConvertToIntUnitTest
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{
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[TestMethod]
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public void WhenPassCorrectFromatedStringToIntParse_ThenCorrectOutputInteger()
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{
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var input = "345 ";
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var expected = 345;
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var actual = 0;
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try
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{
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actual = int.Parse(input);
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}
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catch (ArgumentNullException ex)
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{
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Console.WriteLine("ArgumentNullException");
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}
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Assert.AreEqual(expected, actual);
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}
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[TestMethod]
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public void WhenPassNullStringToIntParse_ThenNullException()
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{
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string input = null;
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var expected = "ArgumentNullException";
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var output = 0;
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var actual = string.Empty;
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try
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{
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output = int.Parse(input);
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}
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catch (ArgumentNullException ex)
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{
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actual = "ArgumentNullException";
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}
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Assert.AreEqual(expected, actual);
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}
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[TestMethod]
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public void WhenPassCorrectFromatedStringToConvertToInt_ThenCorrectOutputInteger()
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{
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var input = "345 ";
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var expected = 345;
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var actual = Convert.ToInt32(input);
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Assert.AreEqual(expected, actual);
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}
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[TestMethod]
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public void WhenPassNullStringToConvertToInt_ThenZero()
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{
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string input = null;
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var expected = 0;
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var actual = Convert.ToInt32(input);
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Assert.AreEqual(expected, actual);
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}
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[TestMethod]
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public void WhenPassCorrectFromatedStringToIntTryParse_ThenCorrectOutputIntegerWIthReturnTrue()
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{
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var input = "345 ";
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var expected = 345;
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var expectedSuccess = true;
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var actualSuccess = int.TryParse(input, out var actual);
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Assert.AreEqual(expected, actual);
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Assert.AreEqual(expectedSuccess, actualSuccess);
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}
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[TestMethod]
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public void WhenPassNullStringToIntTryParse_ThenReturnFalse()
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{
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string input = null;
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var expected = 0;
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var expectedSuccess = false;
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var actualSuccess = int.TryParse(input, out var actual);
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Assert.AreEqual(expected, actual);
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Assert.AreEqual(expectedSuccess, actualSuccess);
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}
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}
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}

‎csharp-basic-topics/IntParseVsConvertToInt/Tests/Tests.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net6.0</TargetFramework>
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<Nullable>enable</Nullable>
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<IsPackable>false</IsPackable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
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<PackageReference Include="MSTest.TestAdapter" Version="2.2.7" />
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<PackageReference Include="MSTest.TestFramework" Version="2.2.7" />
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<PackageReference Include="coverlet.collector" Version="3.1.0" />
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</ItemGroup>
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</Project>

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