Output multiple variables in one rich text box in c# [duplicate]

问题

This question already has answers here:

Creating a newline in rich text box (2 answers)

How to output variables to a rich text box one after the other in c#? (2 answers)

Closed 2 years ago.

void ClearAllRichtextboxes()
{
    richTextBox3.Clear();
    richTextBox5.Clear();
    richTextBox6.Clear();
    richTextBox9.Clear();
    richTextBox10.Clear();
}

ClearAllRichtextboxes();

if (comboBox5.Text == "Primer")
{
    richTextBox5.Text = "This is the number of primer tins" + primer.ToString();
    richTextBox6.Text = "This is the cost of the primer tins" + primercost.ToString();
}

if (comboBox3.Text == "Matt")
{
    richTextBox10.Text = "This is how many 2.5 tins of paint are needed: " + val44.ToString();
    richTextBox9.Text = "This is the matt cost" + valmatt.ToString();
}

if (comboBox3.Text == "Vinyl ")
{
    richTextBox10.Text = "This is how many 2.5 tins of paint are needed" + val44.ToString();
    richTextBox9.Text = "This is the of vinyl cost" + valmatt.ToString();
}

if (comboBox3.Text =="Silk")
{
    richTextBox10.Text = "This is how many 2.5 tins of paint are needed" + silkval.ToString();
    richTextBox9.Text = "This is the cost: " + valcostsilk.ToString();
}

Hi, I need to output the variables of valcostsilk.ToStrin, silkval.ToStrin, valmatt.ToString, val44.ToString, val44.ToString. Pretty much all of them to just ONE rich text box. As I am new to c# so, I have no idea. I asked on a previous thread, but I couldn't seem to get the answer I needed. Someone mentioned Enviorment.Newline, but I can't seem to program it right.

Any help appreciated.

回答1:

You need to put your if statements into the event handler for comboBox3 changing. To do this just double-click the comboBox in the designer view and it will create the event handler in the code-behind for you. Move your if statements all into there (you could also use a switch statement). Also shown is how you create a single complex string into the Text property including a newline. I avoid concatenating with +. $"{}" is cleaner IMHO.

Your code also needs to be cleaned up - you're clearing the same RTB twice in your method for instance, and you reference both comboBox5 and 3 for apparently the same purpose in your series of ifs. You will also need fewer RTBs. Hope it helps.

    private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (comboBox3.Text == "Matt")
        {
            richTextBox10.Text = $"This is how many 2.5 tins of paint are needed: {val44.ToString()}.{Environment.NewLine}This is the matt cost: {valmatt.ToString()}";
            richTextBox10.Update();
        }
    }

Example of switch statement:

switch (comboBox3.Text)
{
    case ("Matt"):
        {
            richTextBox10.Text = $"This is how many 2.5 tins of paint are needed: {val44.ToString()}.{Environment.NewLine}This is the matt cost: {valmatt.ToString()}";
            richTextBox10.Update();
            break;
        }

    case ("Vinyl"):
        {    (insert code)
             break;
        }
}

来源：https://stackoverflow.com/questions/45400181/output-multiple-variables-in-one-rich-text-box-in-c-sharp

标签

variables

richtextbox