Check if textbox is empty - is there a better way?

Question

I want to check if textbox is not empty.

Is there a better (more elegant, simpler) way than:

String.IsNullOrWhiteSpace(null == txtBox ? null : txtBox.Text)

It is worth to note that String.IsNullOrWhiteSpace(txtBox.Text) throws NullReferenceException if txtBox is null .

Answer 1

Not really - however, you could make a little extension if it would save you time:

public static class TextBoxExtensions
{
    public static bool IsEmpty(this TextBox textBox)
    {
        return string.IsNullOrWhiteSpace(null == textBox ? null : textBox.Text);
    }
}

usage:

if(TextBox1.IsEmpty())
{
    ....

Answer 2

假设您的txtBox可以为null（我想这是一个动态创建的控件），则可以执行以下操作：

bool isEmptyOrNull = txtBox == null || string.IsNullOrWhiteSpace(txtBox.Text)