出现组合框错误 [英] combobox error occured

问题描述

我有两个combo_box，其中一个填充白色字体，另一个填充白色字体
当我运行程序时说此错误:

Hi,
I have two combo_box one of them fill whit font and another one fill whit font size
when i run program say this error:

"0"的值对于"emSize"无效. "emSize"应大于0且小于或等于System.Single.MaxValue.
参数名称:emSize

Value of ''0'' is not valid for ''emSize''. ''emSize'' should be greater than 0 and less than or equal to System.Single.MaxValue.
Parameter name: emSize

字体组合框:

font combobox:

private void fontComboBox1_SelectedIndexChanged(object sender, EventArgs e)
       {
           richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));
       }

字体大小组合框:

font size combobox:

private void cmbSize_SelectedIndexChanged(object sender, EventArgs e)
        {
            richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));
        }

并在字体组合框中出现此行错误:

and error occurred for this line in font combobox:

richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));

推荐答案

该错误与组合框无关.

错误消息清楚地表明

The error has no relation with combobox.

the error message clearly says the

emSize

字体构造函数的第二个参数应该是从0到System.Single.MaxValue

因此请检查

that is second param to the font constructor should be from 0 to System.Single.MaxValue

so put a check for

cmbSize.SelectedItem

在行之前

before line

richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));.

var FontSize = Convert.ToInt32(cmbSize.SelectedItem);
if (0 < FontSize && FontSize < System.Single.MaxValue )
{
richtextbox1.SelectionFont=newFont(fontComboBox1.Text,Convert.ToInt32(cmbSize.SelectedItem));.


}
else
{
// show error msg for in correct size
}

''emSize''是字体大小.未指定字体大小0，然后会出现错误.

''emSize'' is the font size. The font size 0 is unspecified, and then you''ll get an error.

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