C# Visual Studio 中的条件断点
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Conditional breakpoint in Visual Studio
提问by Captain Comic
I want to set a breakpoint on a certain line in C# code when some other variable is equal to a specific value, say:
当某些其他变量等于特定值时，我想在 C# 代码的某一行上设置断点，例如：
MyStringVariable == "LKOH"
How can I do that?
我怎样才能做到这一点？
I tried to right click on breakpoint icon -> Condition and then typed MyStringVariable == "LKOH"and Visual Studio said it cannot evaluate it.
我尝试右键单击断点图标 -> 条件，然后键入MyStringVariable == "LKOH"，Visual Studio 表示无法对其进行评估。
采纳答案by Hans Passant
Sample code:
示例代码：
static void Main(string[] args) {
string myvar;
for (int ix = 0; ix < 10; ++ix) {
if (ix == 5) myvar = "bar"; else myvar = "foo";
} // <=== Set breakpoint here
}
Condition: myvar == "bar"
条件：myvar == "bar"
Works well.
效果很好。
回答by David Boike
Just like in code, you need to use:
就像在代码中一样，您需要使用：
MyStringVariable == "LKOH"
The double-equals is the key. Without it, it's saying it can't evaluate because your expression doesn't evaluate to a boolean.
双等号是关键。没有它，它表示它无法评估，因为您的表达式不会评估为布尔值。
回答by AxelEckenberger
The variable you are testing for needs to be in scope at the breakpoint.
您正在测试的变量需要在断点处的范围内。
var x = "xxx";
{
var y = "yyy";
}
brak(); // x is in scope, y isn't
回答by Danny G
if (MyStringVariable == "LKOH") Debugger.Break();
if (MyStringVariable == "LKOH") Debugger.Break();
you'll need System.Diagnostics namespace
你需要 System.Diagnostics 命名空间
http://msdn.microsoft.com/en-us/library/system.diagnostics.debugger.break.aspx
http://msdn.microsoft.com/en-us/library/system.diagnostics.debugger.break.aspx
回答by Jamie Ide
You should be able to make this work. Are you using the Exchange instance name in the condition? The condition should be something like myExchange.Name == "LKOH"not Exchange.Name == "LKOH".
你应该能够完成这项工作。您是否在条件中使用 Exchange 实例名称？条件应该类似于myExchange.Name == "LKOH"not Exchange.Name == "LKOH"。
By the way, using the assignment operator =instead of the equality operator ==will work but it will set the property and waste 1/2 hour of your time figuring out what the hell is going on. I made this mistake just yesterday.
顺便说一句，使用赋值运算符=而不是相等运算符==会起作用，但它会设置属性并浪费 1/2 小时的时间来弄清楚到底发生了什么。我昨天刚刚犯了这个错误。
回答by Nick
In my case, I forgot that I was debugging a VB application.
就我而言，我忘记了我正在调试 VB 应用程序。
In VB equality is =not ==like many other languages, thus my conditional breakpoint needed to be myString = "someValue"not myString == "someValue"
在VB中的平等是=不是==像许多其他语言，因此我的条件断点需要的是myString = "someValue"不myString == "someValue"
