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How to force StateHasChanged in blazor? [closed]

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I have this code:
<div class="col-lg-12 control-section toast-default-section">
<SfToast ID="toast_default" #ref="ToastObj" Title="Error" Content="#a" </SfToast>
</div>
#code{
a = "Test";
StringBuilder b = new StringBuilder();
b.Append("Hello ");
if (b.ToString() != "")
{
a = a+ b;
StateHasChanged();
await ToastObj.ShowAsync();
}
}
When this "ToastObj" open, I need click 2 times to refresh. I don't know why.
For example:
First Result: Test
Second Result: Test Hello
I need click two times to refresh.

For the future, it would be helpful to see all the code, including the SFToast component.
However, You are calling it correctly. All you have to do to Get the page to refresh is to have the code hit the "StateHasChanged()" function. I think the problem is that you have code sitting outside of any function. Consider the #code{} to act like a normal class file with a few diffrences. For example there is no "Constructor" but the first method called on creation will be the OnInitalized(). I suggest wrapping the code and making sure all variables are initialized
#code{
protected override void OnInitialized()
{
var a = "Test";
StringBuilder b = new StringBuilder();
b.Append("Hello ");
if (b.ToString() != "")
{
a = a+ b;
StateHasChanged();
await ToastObj.ShowAsync();
}
}
}

Try use InvokeAsync(StateHasChanged);

Call function1 with function2 arguments [closed]

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I'm new to C#, with basic knowledge from other languages. And I came up with this problem:
public void startupMessage(string appTitle, string (((color))))
{ V--------V
Console.ForegroundColor = ConsoleColor.(((color)));
}
What I think is some of the problem is that the second parameter has to be something else than string. But I'm not sure.

I see two possible solutions for the problem:
First is to use ConsoleColor as an argument type:
public void startupMessage(string appTitle, ConsoleColor color)
{
Console.ForegroundColor = color;
}
Second is to parse the argument:
public void startupMessage(string appTitle, string color)
{
Console.ForegroundColor = (ConsoleColor) Enum.Parse(typeof(ConsoleColor), color);
}

The modifier "private" in not valid for this item c# [closed]

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Closed 5 years ago.
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I dont know what to do, im new to whole coding and the project im working on is going quite well, tried adding more commands and this problem jumps to the first private part here. If needed i can send the rest of the code
RegisterYNCommand();
{
}
private void RegisterYNCommand();
{
{
Commands.CreateCommand("YN")
.Do(async (e) =>
{
int yesnoIndex = rand.Next(randomTexts.Length);
string memeToPost = yesno[yesnoIndex];
await e.Channel.SendMessage(memeToPost);
});

Remove the first
RegisterNYCommand();
{
}
Looks like duplicated code...
and the ; at the end of
private void RegisterNYCommand(); // This ';'
{
Commands.CreateCommand("YN")
.Do(async (e) =>
{
int yesnoIndex = rand.Next(randomTexts.Length);
string memeToPost = yesno[yesnoIndex];
await e.Channel.SendMessage(memeToPost);
});
}

Just remove ; character after your methods declaration:
private void RegisterYNCommand()
{

xamarin Android.Util.AndroidRuntimeException: Activity{x} did not call through to super.onStart() [closed]

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I get this error for the code shown below and don't know why.
my code is:
protected override void OnStart()
{
if (WCHSBMobileApplication.Current.SuperBillObject == null)
{
AddSuperBill();
}
else
{
EditSuperBill();
}
}
what can I do?

The exception message says it all:
You removed this line:
base.OnStart();
You need to add it back:
protected override void OnStart()
{
base.OnStart();
if (WCHSBMobileApplication.Current.SuperBillObject == null)
{
AddSuperBill();
}
else
{
EditSuperBill();
}
}

how to write method which returns object? [closed]

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Is this a write way?suggest me.
public Init_Circle Init_Circle(Point pt,double rad)
{
Point center=pt;
if (rbCircle.Checked==true)
{
pt.x = double.Parse(txtCirCntPtX.Text.Trim());
pt.y = double.Parse(txtCirCntPtY.Text.Trim());
rad = double.Parse(txtCirRadius.Text.Trim());
}
return this.Init_Circle(pt,rad);
}

You can't return anything from the constructor, but what you can do is create a static method that creates the object for you.
So in your constructor do it like this.
private Init_Circle()
{
}
and create a method like this
public static Init_Circle CreateInstance(// parameters here)
{
// do object creation here
}

You should create a method which will returns object. You can't return anything in a constructor.
Method should look like this:
public Init_Circle ReturnCircle(Point pt,double rad)
{
Point center=pt;
if (rbCircle.Checked==true)
{
pt.x = double.Parse(txtCirCntPtX.Text.Trim());
pt.y = double.Parse(txtCirCntPtY.Text.Trim());
rad = double.Parse(txtCirRadius.Text.Trim());
}
return this.Init_Circle(pt,rad);
}