Contvert input string into integer

.gitignore

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+.vs/
+bin/
+obj/

String2IntTest/String2IntTest.sln

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+EndProject
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+EndProject
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+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
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String2IntTest/String2IntTest/String2Int.cs

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+using System;
+/**
+ * Fillter all integers in given string, build whole integer and return it
+ * 
+ * Note: The reason it doesn't have Main function is, it is supposed to be a
+ * converter and used as utility function.
+ * 
+ * **/
+namespace String2IntTest
+{
+    public class String2Int
+    {
+        int _Integer;
+        public int GetInteger
+        {
+            get { return _Integer; }
+        }
+        public void FillterInteger(string strinput)
+        {
+            int output = 0 ;
+            bool IsHasDigit = false;
+
+            if (strinput.Length == 0)
+            {
+                throw new ArgumentException("No input data");
+            }
+
+            foreach (char i in strinput)
+            {   
+                if (IsDigit(i))
+                {
+                    IsHasDigit = true;
+                    output = (output * 10) + ((int)i - 48);
+                }
+            }
+
+            if (!IsHasDigit && output == 0)
+            {
+                throw new ArgumentException("Output is null");
+            }
+
+            _Integer = output;
+        }
+        private bool IsDigit(char c)
+        {
+            return (int)c >= 48 && (int)c <= 57 ;
+        }
+    }
+
+}

String2IntTest/String2IntTest/String2IntTest.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Library</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <ApplicationIcon />
+    <StartupObject />
+  </PropertyGroup>
+
+</Project>

String2IntTest/String2IntTestTests/String2IntTestTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>.NETCoreApp,Version=v3.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
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+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
+    <PackageReference Include="MSTest.TestAdapter" Version="2.2.3" />
+    <PackageReference Include="MSTest.TestFramework" Version="2.2.3" />
+    <PackageReference Include="coverlet.collector" Version="3.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\String2IntTest\String2IntTest.csproj" />
+  </ItemGroup>
+
+</Project>

String2IntTest/String2IntTestTests/String2IntTests.cs

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+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using String2IntTest;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace String2IntTest.Tests
+{
+    [TestClass()]
+    public class String2IntTests
+    {
+        [TestMethod()]
+        public void TestNoInputData()
+        {
+            try
+            {
+                String2Int strinput = new String2Int();
+                strinput.FillterInteger("");
+            }
+            catch (ArgumentException e)
+            {
+                StringAssert.Contains(e.Message, "No input data");
+            }
+
+        }
+
+        [TestMethod()]
+        public void TestSpecialCharactersOnly()
+        {
+            try
+            {
+                String2Int strinput = new String2Int();
+                strinput.FillterInteger(" *,");
+            }
+            catch (ArgumentException e)
+            {
+                StringAssert.Contains(e.Message, "Output is null");
+            }
+
+        }
+
+
+        [TestMethod()]
+        public void TestIntegerOnly()
+        {
+
+            String2Int strinput = new String2Int();
+            strinput.FillterInteger("034599");
+            Assert.AreEqual(034599, strinput.GetInteger);
+
+
+        }
+        [TestMethod()]
+        public void TestSampleInputA()
+        {
+            String2Int strinput = new String2Int();
+            strinput.FillterInteger("abc573");
+            Assert.AreEqual(573, strinput.GetInteger);
+
+        }
+
+        [TestMethod()]
+        public void TestSampleInputB()
+        {
+            String2Int strinput = new String2Int();
+            strinput.FillterInteger("a5b7c3");
+            Assert.AreEqual(573, strinput.GetInteger);
+
+        }
+
+    }
+}