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I have been trying to wrap my head around this FXCop violation "DoNotDeclareReadOnlyMutableReferenceTypes" MSDN: http://msdn.microsoft.com/en-us/library/ms182302%28VS.80%29.aspx Code from MSDN which would cause this violation: namespace SecurityLibrary { public class MutableReferenceTypes { static protected readonly StringBuilder SomeStringBuilder; static MutableReferenceTypes() { SomeStringBuilder = new StringBuilder(); } } } From Jon's answer here and here , I understand that the field holding the reference to the object (in this case SomeStringBuilder) is readonly and not the object itself

Is there an easy way to open an sqlite3 database using the DB-compliant sqlite3 module in a way that is read-only? I want to access a database read-only on a file system that doesn't support locking. I know that the C api supports this, but can't figure out a way to do this with the sqlite3 interface. As of Python 3.4.0 you can open the database in read only mode with the following: db = sqlite3.connect('file:/path/to/database?mode=ro', uri=True) vy32 Apparently it is possible using APSW, which is not DB API compliant. https://github.com/rogerbinns/apsw At least that was the case in 2009. 来源：

I would like to give a module variable a read-only access for client modules. Several solutions: 1 . The most common one: // module_a.c static int a; int get_a(void) { return a; } // module_a.h int get_a(void); This makes one function per variable to share, one function call (I am thinking both execution time and readability), and one copy for every read. Assuming no optimizing linker. 2 . Another solution: // module_a.c static int _a; const int * const a = &_a; // module_a.h extern const int * const a; // client_module.c int read_variable = *a; *a = 5; // error: variable is read-only I like

public class ClassA { public static readonly string processName; } public class ClassB : ClassA { static ClassB() { processName = "MyProcess.exe"; } } I am getting an error while compiling the above C# code. The error says -- "A static readonly field cannot be assigned to (except in a static constructor or a variable initializer)" But I am assigning it in a static constructor. The need for such a static variable is that, the base class has methods that uses this variable, but the derived classes and the base class must have different values for this variable. But the value is constant across

I have a GridView with two CheckBoxField columns. They both have ReadOnly property set to false, but html code generated for them has attribute disabled="disabled". So the value cannot be changed. Generated HTML example: <span disabled="disabled"><input id="ctl00_ContentBody_GridView_ctl02_ctl01" type="checkbox" name="ctl00$ContentBody$GridView$ctl02$ctl01" checked="checked" disabled="disabled" /></span> Can anybody say how to figure it out? PhilPursglove This is by design; rows in a GridView are not editable by default. There's two ways you might address this: 1. Add an Edit link In your

My Goal: Create a C# class for predefined errors that have both an ID and a Message. Here was what I tried: public class MyError { public static readonly MyError OK = new MyError(0, "OK"); public static readonly MyError Bad = new MyError(1, "Bad Stuff"); public MyError(int id, string message) { this.Id = id; this.Message = message; } public readonly int Id; public readonly string Message; } This compiles just fine and I am sure it would work just fine in practice. But I always like to follow Code Analysis guidelines. In the above case, CA2104 is violated "Do not declare read only mutable