c# Windows Form，用另一个字符串替换文本框中的字符串（文件内容）

Question

我有一个包含已加载文件的所有行的文本框。 它看起来像这样：

我可以在应用程序中加载包含特定字符串的文件的特定行：

如果有任何文本框会被更改，我将如何在按下“编辑模块”按钮后更新文件/主文本框。

例如，我将考试权重：“0.4”更改为考试权重：“0.6”，然后按“编辑模块”按钮，该按钮将编辑主文本框（文件内容）。然后，我可以使用更新的内容保存文件。

这是我用来根据文本框中的字符串从文件中获取特定行的代码：

    private void editModuleButton_Click(object sender, EventArgs e)
    {
        citation = editModuleComboBox.Text;

        citationChange();
    }

    private void citationChange()
    {
        List<string> matchedList = new List<string>();

        string[] linesArr = File.ReadAllLines(fileName);

        //find matches
        foreach (string s in linesArr)
        {
            if (s.Contains(citation))
            {
                matchedList.Add(s); //matched
            }
        }

        //output
        foreach (string s in matchedList)
        {
            string citationLine = s;
            string[] lineData = citationLine.Split(',');
            selectedModuleLabel.Text = lineData[2];
            moduleTitleTextBox.Text = lineData[3];
            creditsTextBox.Text = lineData[4];
            semesterTextBox.Text = lineData[5];
            examWeightingTextBox.Text = lineData[6];
            examMarkTextBox.Text = lineData[7];
            testWeightingTextBox.Text = lineData[8];
            testMarkTextBox.Text = lineData[9];
            courseworkWeightingTextBox.Text = lineData[10];
            courseworkMarkTexbox.Text = lineData[11];
        }
    }

如果有足够代表的人可以将图片插入这篇文章，那就太好了。谢谢

Answer 1

此解决方案可能并不完美，但应该适合您。您需要做的是，每当按下 Edit Module 按钮时，根据文本字段创建一个新字符串并将其替换为原始行。先在类内部声明一个字符串变量private string ChangedString = "";，然后：

    foreach (string s in matchedList)
    {
        string citationLine = s;
        string[] lineData = citationLine.Split(',');
        string Stream = lineData[0]; //Store this somewhere so that it can be accessed later
        string Stage = lineData[1]; //Store this somewhere so that it can be accessed later
        selectedModuleLabel.Text = lineData[2];
        moduleTitleTextBox.Text = lineData[3];
        creditsTextBox.Text = lineData[4];
        semesterTextBox.Text = lineData[5];
        examWeightingTextBox.Text = lineData[6];
        examMarkTextBox.Text = lineData[7];
        testWeightingTextBox.Text = lineData[8];
        testMarkTextBox.Text = lineData[9];
        courseworkWeightingTextBox.Text = lineData[10];
        courseworkMarkTexbox.Text = lineData[11];
    }

如果您还没有将Stream 和Stage 存储在任何文本框/组合框中，则在以下行中相应地替换它们。现在在EditButton_Click [点击事件] 写：

ChangedString  = Stream + "," + Stage + "," + selectedModuleLabel.Text + "," + moduleTitleTextBox.Text
                + "," + creditsTextBox.Text + "," + semesterTextBox.Text + "," +  examWeightingTextBox.Text + "," 
                + examMarkTextBox.Text + "," + courseworkWeightingTextBox.Text + "," + courseworkMarkTexbox.Text;

现在用原行替换这个字符串。

编辑：你会得到正在编辑的行号，把它存储在一个变量中，比如说

int LineBeingEdited = 3 //Supposing line number three is being edited.

然后在同一个 Click 事件中你可以这样写：

ChangedString  = Stream + "," + Stage + "," + selectedModuleLabel.Text + "," + moduleTitleTextBox.Text
                + "," + creditsTextBox.Text + "," + semesterTextBox.Text + "," +  examWeightingTextBox.Text + "," 
                + examMarkTextBox.Text + "," + courseworkWeightingTextBox.Text + "," + courseworkMarkTexbox.Text;

var lines = TextBox1.Lines;
lines[LineBeingEdited] = ChangedString;
TextBox1.Lines = lines;

编辑 2：要获得行号，我建议您将 for each 循环修改为 for 循环。还要添加一个int 变量来存储类中的行号，例如：private int LineBeingEdited = 0;

修改这个for each：

foreach (string s in linesArr)
    {
        if (s.Contains(citation))
        {
            matchedList.Add(s); //matched
        }
    }

到for循环：

for (int a = 0; a < linesArr.Length; a++)
     {
        if (s.Contains(citation))
        {
           matchedList.Add(linesArr[a]); //matched
           LineBeingEdited = a;
           break; //breaks the loop when a match is found
        }
     }

考虑到总会有单一匹配，正在使用上述方法。 LineBeingEdited 现在将具有行号，并且可以从类中的任何位置访问