Convert nullable bool to bool

Question

How do you convert a nullable bool  to bool in C    I have tried x Value or x HasValue

User · Answer

This is an interesting variation on the theme. At first and second glances you would assume the true branch is taken. Not so!

bool? flag = null;
if (!flag ?? true)
{
    // false branch
}
else
{
    // true branch
}

The way to get what you want is to do this:

if (!(flag ?? true))
{
    // false branch
}
else
{
    // true branch
}

User · Answer

bool  a   null  bool b   Convert toBoolean a

User · Answer

If you re going to use the bool  in an if statement  I find the easiest thing to do is to compare against either true or false   bool  b         if  b    true    Debug WriteLine  true     if  b    false    Debug WriteLine  false     if  b    true    Debug WriteLine  false or null     if  b    false    Debug WriteLine  true or null       Of course  you can also compare against null as well   bool  b         if  b    null    Debug WriteLine  null     if  b    null    Debug WriteLine  true or false     if  b HasValue    Debug WriteLine  true or false       HasValue and    null will ALWAYS return the same value  so use whatever you like    If you re going to convert it to a bool to pass on to other parts of the application  then the Null Coalesce operator is what you want   bool  b        bool b2   b    true     null becomes true b2   b    false     null becomes false   If you ve already checked for null  and you just want the value  then access the Value property    bool  b        if b    null      throw new ArgumentNullException    else     SomeFunc b Value

User · Answer

This answer is for the use case when you simply want to test the bool  in a condition  It can also be used to get a normal bool  It is an alternative I personnaly find easier to read than the coalescing operator      If you want to test a condition  you can use this  bool  nullableBool   someFunction    if nullableBool    true          Do stuff     The above if will be true only if the bool  is true   You can also use this to assign a regular bool from a bool   bool  nullableBool   someFunction    bool regularBool   nullableBool    true    witch is the same as  bool  nullableBool   someFunction    bool regularBool   nullableBool    false

User · Answer

You can use the null-coalescing operator  x    something  where something is a boolean value that you want to use if x is null   Example   bool  myBool   null  bool newBool   myBool    false    newBool will be false

User · Answer

Something like   if  bn HasValue      b   bn Value

User · Answer

System Convert works fine by me   using System      Bool fixed   Convert ToBoolean NullableBool

User · Answer

You can use Nullable T  GetValueOrDefault   method  This will return false if null    bool  nullableBool   null    bool actualBool   nullableBool GetValueOrDefault

User · Answer

The complete way would be   bool b1  bool  b2        if  b2 HasValue     b1   b2 Value    Or you can test for specific values using  bool b3    b2    true      b2 is true  not false or null

User · Answer

You ultimately have to decide what the null bool will represent   If null should be false  you can do this   bool newBool   x HasValue   x Value   false    Or   bool newBool   x HasValue  amp  amp  x Value    Or   bool newBool   x    false

User · Answer

The easiest way is to use the null coalescing operator      bool  x        if  x    true          The    with nullable values works by examining the provided nullable expression   If the nullable expression has a value the it s value will be used else it will use the expression on the right of

[c#] Convert nullable bool? to bool

Examples related to c#

Examples related to nullable