如何检索文件数据(.txt)到各自的文本框

本文关键字：文本 数据 何检索 检索 文件 txt | 更新日期: 2023-09-27 18:03:24

在我的代码中，我使用保存文件对话框将文本框数据写入文本文件，这将保存我的文本框数据到指定的文本文件。我的问题是，我需要检索回文件数据到各自的文本框时，用户需要…我该怎么做呢?

  private void SaveData_Click(object sender, EventArgs e)
    {
       // Stream myStream;
        SaveFileDialog saveFileDialog1 = new SaveFileDialog();
        saveFileDialog1.InitialDirectory = "c:''";
        saveFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
        saveFileDialog1.FilterIndex = 2;
        saveFileDialog1.RestoreDirectory = true;
        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
        {
            if ((myStream = saveFileDialog1.OpenFile()) != null)
            {
                // Code to write the stream goes here.
                using (StreamWriter objWriter = new StreamWriter(myStream))
                {
                    objWriter.Write(textBox1.Text);
                    objWriter.Write(","); 
                    objWriter.Write(textBox2.Text);
                    objWriter.Write(",");
                    objWriter.Write(textBox3.Text);
                    objWriter.Write(",");
                    objWriter.Write(textBox4.Text);
                    MessageBox.Show("Details have been saved");
                }

                myStream.Close();
            }
        }
    }
    private void Retrieve_Click(object sender, EventArgs e)
    {
        //Stream myStream = null;
        OpenFileDialog openFileDialog1 = new OpenFileDialog();
        openFileDialog1.InitialDirectory = "c:''";
        openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
        openFileDialog1.FilterIndex = 2;
        openFileDialog1.RestoreDirectory = true;
        if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            try
            {
                if ((myStream = openFileDialog1.OpenFile()) != null)
                {
                    using (myStream)
                    {
                        // Insert code to read the stream here.
                        textBox1.Text = (myStream).ToString();
                      textBox2.Text = ().ToString();
                      textBox3.Text = ().Tostring();
                      textBox4.text = ().Tostring();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
            }
        }
    }

如何检索文件数据(.txt)到各自的文本框

您需要使用OpenFileDialog控件并将其传递给ReadAllText方法。

下面是一个例子:

    myAmazingTextBox.Text = File.ReadAllText(openFileDialog1.FileName);

保存用户保存数据的位置下次你应该先阅读路径。您可以保存saveFileDialog1.FileName .

使用下面的代码检索保存在文件中的文本(在try块中更改的代码)

private void Retrieve_Click(object sender, EventArgs e)
{
    //Stream myStream = null;
    OpenFileDialog openFileDialog1 = new OpenFileDialog();
    openFileDialog1.InitialDirectory = "c:''";
    openFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
    openFileDialog1.FilterIndex = 2;
    openFileDialog1.RestoreDirectory = true;
    if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
        try
        {
            // Read all text stored in the file
            string fileData = File.ReadAllText(openFileDialog1.FileName);
            // As you are appending textbox data using comma as separator, 
            // so split the text read from file on comma separator
            string[] parts = fileData.Split(','); 
            // as there were 4 textboxes, so after split, the 'parts' array should contain 4 elements, otherwise, the file/data is invalid
            if(parts.Length != 4)
            {
                 MessageBox.Show("Invalid source file.");
                 return;
            }
            // set the respective values into the textboxes 
            textBox1.Text = parts[0];
            textBox2.Text = parts[1];
            textBox3.Text = parts[2];
            textBox4.text = parts[3];
        }
        catch (Exception ex)
        {
            MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
        }
    }

我想建议你不要使用逗号作为分隔符，因为用户可能会在内容中输入包含逗号的文本。我建议您将文本编码为Base64字符串(仅包含A-Za-z0-9和另外两个不包含逗号的字符)。因此，您可以使用逗号分隔符分隔base64编码的字符串，这样您就可以100%确定逗号只是分隔符，而不是内容的一部分。

读取时，解码base64字符串并显示到文本框中

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