如何写入文本框

问题描述

我正在一次读取一行文本文件并尝试解析并提取值，然后将其写入文本框。在一个简单的教程中，我可以写入文本框。



这个工作...

I'm reading a text file one line at a time and trying to parse and extract a value then write it to a text box. In a simple tutorial I can write to the textbox.

this works...

private void button1_Click(object sender, EventArgs e)
 {
     textBox1.Text = "My test";
     txbSysColors.Text = "";
 }

 private void button2_Click(object sender, EventArgs e)
 {
     txbSysColors.Text = "System Colors";
     textBox1.Text = "";
 }

我尝试过：



当我添加条件语句时，即使在引号之间传递文字字符串，我也无法再写文本框。我看到str的内容，包含的数据是正确的。



所有文本框保持空白运行此代码。

What I have tried:

When I add conditional statements I can no longer write the text boxes even passing a literal string between quotes. I see the contents of "str" and the data contained is correct.

all the text boxes remain blank running this code.

private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.ShowDialog();
            StreamReader stream = new StreamReader(openFileDialog1.FileName);

            string str = "";

            while ((str = stream.ReadLine()) != null)
            {
                if (str.Contains("SYS_CLR"))
                {
                    txbSysColors.Text = str.Split('=').Last().ToString();
                    txbSysColors.Text = "here";
                    textBox1.Text = "here";
                    textBox1.Text = str;
                }
            }
        }

是否有一些范围问题我不理解？

Is there some scope issue I'm not understanding?

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