C#•17mo ago

✅ How to change of property without setter?

I have ObjectCollection with different objects: TableCell, TextObject etc. What I want: find TableCell, TextObject adn change their font family name. I did following:

var reportObjects = _report.AllObjects;
for (var i = 0; i < reportObjects.Count; i++)                                                 
{                                                                                               
    if (reportObjects[i] is TableCell)                                                      
        ((reportObjects[i] as TableCell)!).Font = new Font("Calibri", 20);                
    if (reportObjects[i] is TextObject)                                                     
        ((reportObjects[i] as TextObject)!).Font = new Font("Calibri", 20);               
}

var reportObjects = _report.AllObjects;
for (var i = 0; i < reportObjects.Count; i++)                                                 
{                                                                                               
    if (reportObjects[i] is TableCell)                                                      
        ((reportObjects[i] as TableCell)!).Font = new Font("Calibri", 20);                
    if (reportObjects[i] is TextObject)                                                     
        ((reportObjects[i] as TextObject)!).Font = new Font("Calibri", 20);               
}

my code change full font now but I don't need this because I don't wanna change original font size! I can do smth like this.. ((reportObjects[i] as TableCell)! ).Font.Name = .. but Name is doesn't have any setter. So what to do? I wanna change only font name

26 Replies

Pobiega•17mo ago

Font.Name isn't something you can change, you need to change the entire font instance even if managed to change it, it wouldn't result in a new font - just that you changed the displayname of the current font

SWEETPONY•17mo ago

saltypatron.eth•17mo ago

Does reflection work if theres no setter?

Pobiega•17mo ago

Doesn't matter, wont change the font

saltypatron.eth•17mo ago

I think you're looking for how to retrieve the current font size and return that, regardless of the font name Was just curious 😛

Pobiega•17mo ago

he wants to change the font

saltypatron.eth•17mo ago

Right. If the name changes and he uses the previous font size, he solves his problem he's instantiating a new font class which will look for any installed font matching that name

Pobiega•17mo ago

No, Font doesnt magically change if you use reflection to edit the name field new Font("Your wanted font", oldFont.Size); should do what you want

saltypatron.eth•17mo ago

Sorry, different contexts

amio•17mo ago

Also if something is protected or private, there is a reason. Don't abuse reflection to tamper with things in ways that are explicitly discouraged

saltypatron.eth•17mo ago

i swapped over to trying to help and the reflection would be a side discussion

SWEETPONY•17mo ago

I tried this: var fontField = typeof(FontFamily).GetField( "<Name>k__BackingField", BindingFlags.Instance | BindingFlags.Public); but fontField is always null ah yes thx for helping

for (var i = 0; i < reportObjects.Count; i++)                                          
{                                                                                     
    if (reportObjects[i] is TableCell)                                               
    {                                                                                 
        var size = (reportObjects[i] as TableCell )!.Font.Size;                       
        ( reportObjects[ i ] as TableCell )!.Font = new Font("Calibri", size);        
    }                                                                                   
    if (reportObjects[i] is TextObject)                                              
    {                                                                                
        var size = (reportObjects[i] as TextObject)!.Font.Size;                      
        (reportObjects[i] as TextObject)!.Font = new Font("Calibri", size);        
    }                                                                                 
}

for (var i = 0; i < reportObjects.Count; i++)                                          
{                                                                                     
    if (reportObjects[i] is TableCell)                                               
    {                                                                                 
        var size = (reportObjects[i] as TableCell )!.Font.Size;                       
        ( reportObjects[ i ] as TableCell )!.Font = new Font("Calibri", size);        
    }                                                                                   
    if (reportObjects[i] is TextObject)                                              
    {                                                                                
        var size = (reportObjects[i] as TextObject)!.Font.Size;                      
        (reportObjects[i] as TextObject)!.Font = new Font("Calibri", size);        
    }                                                                                 
}

it works!

saltypatron.eth•17mo ago

as long as reportObjects[i] is never null otherwise i think it'll be zero

Pobiega•17mo ago

you could get around that by checking for null, instead of using ! to force the compiler to ignore it

saltypatron.eth•17mo ago

One other thing id say would be to maybe try using a foreach. If you need the index, you could try something to the effect of reportObjects.Select((s,i) => new KeyValuePair<int,obj>(i,s)) an anon object works as well... just couldn' remember the syntax

SWEETPONY•17mo ago

ok, thanks, I wil try it it will be TableCell or TextObject

Pobiega•17mo ago

btw, don't forget that you can assign in the pattern match if (reportObjects[i] is TableCell tableCell)

saltypatron.eth•17mo ago

Probably my favorite new(ish) addition to C# out bool something

Pobiega•17mo ago

pattern matching is amazing.

saltypatron.eth•17mo ago

i meant the assignment of the variable in the output i absolutely hated having to declare the variable prior to because it really messed up loops and stuff and made you rethink things

Pobiega•17mo ago

ah yeah out var is great

SWEETPONY•17mo ago

smth like that?

if(reportObjects[i] is TableCell tableCell)             
{                                                         
    var size = tableCell.Font.Size;                       
    tableCell.Font = new Font("Calibri", size);         
}

if(reportObjects[i] is TableCell tableCell)             
{                                                         
    var size = tableCell.Font.Size;                       
    tableCell.Font = new Font("Calibri", size);         
}

looks good I think

Pobiega•17mo ago

give it a try

SWEETPONY•17mo ago

it works thanks

Pobiega•17mo ago

$close

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✅ How to change of property without setter?