Add line numbers to richtextbox, and you can select the line number

和行号有关的技术难点\WindowsFormsApplication4\bin\Debug\WindowsFormsApplication4.exe
....................\........................\...\.....\WindowsFormsApplication4.pdb
....................\........................\...\.....\WindowsFormsApplication4.vshost.exe
....................\........................\...\.....\WindowsFormsApplication4.vshost.exe.manifest
....................\........................\Form1.cs
....................\........................\Form1.Designer.cs
....................\........................\Form1.resx
....................\........................\obj\Debug\WindowsFormsApplication4.csproj.FileListAbsolute.txt
....................\........................\...\.....\WindowsFormsApplication4.csproj.GenerateResource.Cache
....................\........................\...\.....\WindowsFormsApplication4.exe
....................\........................\...\.....\WindowsFormsApplication4.pdb
....................\........................\...\.....\WindowsFormsApplication4.Properties.Resources.resources
....................\........................\...\.....\WindowsFormsApplication4.Richtextbox测试.resources
....................\........................\...\.....\和行号有关的技术难点.csproj.FileListAbsolute.txt
....................\........................\...\.....\和行号有关的技术难点.csproj.GenerateResource.Cache
....................\........................\Program.cs
....................\........................\...perties\AssemblyInfo.cs
....................\........................\..........\Resources.Designer.cs
....................\........................\..........\Resources.resx
....................\........................\..........\Settings.Designer.cs
....................\........................\..........\Settings.settings
....................\........................\和行号有关的技术难点.csproj
....................\和行号有关的技术难点.sln
....................\和行号有关的技术难点.suo
....................\WindowsFormsApplication4\obj\Debug\Refactor
....................\........................\...\.....\TempPE
....................\........................\bin\Debug
....................\........................\obj\Debug
....................\........................\bin
....................\........................\obj
....................\........................\Properties
....................\WindowsFormsApplication4
和行号有关的技术难点

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