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--- | ||
title: "Get Started with the Debugger in Visual Studio | Microsoft Docs" | ||
ms.custom: "H1Hack27Feb2017" | ||
ms.date: "02/07/2017" | ||
ms.reviewer: "" | ||
ms.suite: "" | ||
ms.technology: | ||
- "vs-ide-debug" | ||
ms.tgt_pltfrm: "" | ||
ms.topic: "get-started-article" | ||
ms.assetid: 0b3138c4-b840-446a-a15c-10ed8e2dd050 | ||
caps.latest.revision: 5 | ||
author: "mikejo5000" | ||
ms.author: "mikejo" | ||
manager: "ghogen" | ||
translation.priority.ht: | ||
- "cs-cz" | ||
- "de-de" | ||
- "es-es" | ||
- "fr-fr" | ||
- "it-it" | ||
- "ja-jp" | ||
- "ko-kr" | ||
- "pl-pl" | ||
- "pt-br" | ||
- "ru-ru" | ||
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- "zh-cn" | ||
- "zh-tw" | ||
--- | ||
# Get Started with the Visual Studio Debugger | ||
The Visual Studio debugger is easy to use in any language. Here we’ll show how to debug a simple C# program, but you can apply the same steps to code in other languages such as C++ and JavaScript. | ||
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To watch a video showing similar features, see [Getting Started with the Debugger](https://www.youtube.com/watch?v=FtGCi5j30YU&list=PLReL099Y5nRfw6VNvzMkv0sabT2crbSpK&index=6). | ||
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## <a name="BKMK_Start_debugging_a_VS_project"></a> Debug a Basic C# Project | ||
Let’s start with a simple C# console application (**File / New / Project**, then select **Visual C#** and then **Console Application**). If you’ve never worked with Visual Studio before, see [Walkthrough: Create a Simple Application](../ide/walkthrough-create-a-simple-application-with-visual-csharp-or-visual-basic.md). The **Main** method just adds 1 to an integer variable 10 times and prints the result to the console: | ||
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```CSharp | ||
static void Main(string[] args) | ||
{ | ||
int testInt = 0; | ||
for (int i = 1; i <= 10; i++) | ||
{ | ||
testInt += 1; | ||
} | ||
Console.WriteLine(testInt); | ||
} | ||
``` | ||
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Build this code in the **Debug** configuration. This configuration is set by default. For more information about configurations, see [Understanding Build Configurations](../ide/understanding-build-configurations.md). | ||
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Run this code in the debugger by clicking **Debug / Start Debugging** (or **Start** on the toolbar, or **F5**). The application should exit almost immediately, so you can’t actually tell whether anything was printed in the Console window. | ||
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You can stop the execution long enough to see the Console window by setting a breakpoint and then stepping ahead. To set a breakpoint, put your cursor in the `Console.WriteLine` line and click **Debug / New Breakpoint / Function Breakpoint**, or just click in the left margin at the same line. The breakpoint should look like this: | ||
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![Set a breakpoint](../debugger/media/getstartedbreakpoint.png "GetStartedBreakpoint") | ||
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For more information about breakpoints, see [Using Breakpoints](../debugger/using-breakpoints.md). | ||
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## <a name="BKMK_Inspect_Variables"></a> Inspect Variables | ||
Debugging often involves finding variables that don't contain the values you expect at a particular point. We will show some of the ways that you can inspect variables. | ||
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Start debugging again. Execution stops before the `Console.WriteLine` code executes. You can cause it to execute by stepping ahead (click **Debug / Step Over** or **F10**). In this case you could have chosen **Step Into** (**F11**) and gotten the same result; we’ll explain the difference later on. The line with the last curly brace of the method should have turned yellow. Look at the Console window. You should see **10**. | ||
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You can hover over the **testInt** variable to view the current value in a data tip. | ||
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![DBG_Basics_Data_Tips](../debugger/media/dbg_basics_data_tips.png "DBG_Basics_Data_Tips") | ||
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Just below the code window you should see the **Autos**, **Locals**, and **Watch** windows. These windows show the current values of variables at the time of execution. Both the **Autos** and the **Locals** windows show **testInt** with a value of **10**. | ||
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![Autos window when debugging](../debugger/media/getstartedwindows.png "GetStartedWindows") | ||
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For more information about these windows, see [Autos and Locals Windows](../debugger/autos-and-locals-windows.md). | ||
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Let’s see how the variable value changes as we walk through the program. Set a breakpoint on the `testInt += 1;` line, and restart debugging. You should see that **testInt** in the **Locals** and **Autos** windows is **0**, and **i** is **1**. When you continue debugging (**Debug / Continue**, or **Continue** on the toolbar, or **F5**), you can see that the value of **testInt** changes to **1**, then **2**, and so on. When you get tired of looking at these changes, remove the breakpoint (**Debug / Toggle Breakpoint**, or click on it in the margin), and continue debugging. If you want to remove all the breakpoints, click **Debug / Delete All Breakpoints**, or **CTRL+SHIFT+F9**, and click **Yes** on the dialog box that asks **Do you want to remove all breakpoints?**. | ||
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## Stepping Into and Over Function Calls | ||
You can execute code in the debugger statement-by-statement (**Step Into**) or you can execute code while the debugger skips functions (**Step Over**) to quickly get to code that you're more interested in (function code is still executed). You can switch between both methods in the same debugging session. | ||
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To see the difference between **Step Into** and **Step Over**, we need to add a method that is called by another method. Add a method to the C# application and call it from the Main method. The code should look something like this: | ||
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```CSharp | ||
static void Main(string[] args) | ||
{ | ||
Method1(); | ||
Console.WriteLine("end"); | ||
} | ||
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private static void Method1() | ||
{ | ||
Console.WriteLine("in Method1"); | ||
} | ||
``` | ||
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Set a breakpoint on the `Method1();` call in the Main method and start debugging. When execution breaks, click **Debug / Step Into** (or **Step Into** on the toolbar, or **F11**). Execution breaks again at the first curly brace in Method1(): | ||
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![Stepping into code](../debugger/media/getstartedstepinto.png "GetStartedStepInto") | ||
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Stop debugging and start again, and when execution breaks at the breakpoint, click **Debug / Step Over** (or **Step Over** on the toolbar, or **F10**). Execution breaks again at `Console.WriteLine("end");`. | ||
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If you want to know more about navigating code with the debugger, see [Navigating through Code with the Debugger](../debugger/navigating-through-code-with-the-debugger.md). |
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