如何将文件内容显示到文本框中? [英] How to display contents of a file to a text box?

问题描述

单击按钮控件后，我想将文件(data.txt)的内容显示到文本框或标签控件中.但是下面的代码只给我一行，而我希望从文件中检索全部内容.

这是我到目前为止的内容:

I want to display the contents of a file (data.txt) to a text box or label control once I click button control. But the code below only gives me one line, while I want the whole content to be retrieved from the file.

This is what I have so far:

private: System::Void Report_Click(System::Object^  sender, System::EventArgs^  e) {
try
         {
               FileStream^ fs = gcnew FileStream(L"data.txt", FileMode::Open);
               StreamReader^ sr = gcnew StreamReader(fs);

              int count = 0;
              for(;;)
              {
                     String^ line  = sr->ReadLine();
                   count++;
            if (line == nullptr) break;
                     this->ReportTextBox->Text=Convert::ToString(line);
                            }

         }
  catch(System::Exception^ pe)
         {
               Console::WriteLine(pe->ToString());
         }
}

提前感谢您可以提供的任何帮助.

Thanx in advance for any kind of help you can give me.

推荐答案

尝试ReadToEnd方法，不要忘记尽快关闭文件不再需要它了:

Try ReadToEnd method, and don''t forget to close your file as soon as you don''t need it anymore:

System::Void Report_Click(System::Object^  sender, System::EventArgs^  e)
{
    try
    {
        StreamReader^ sr = gcnew StreamReader(L"data.txt");
        //read the whole file
        this->ReportTextBox->Text = sr->ReadToEnd();
        //don't forget to close your file
        sr->Dispose();
    }
    catch(System::Exception^ pe)
    {
        Console::WriteLine(pe->ToString());
    }
}

我不知道托管c ++ \ CLI.我正在VC ++中工作.但是从代码中来看，

I do not know about Managed c++\CLI.I am working in VC++.But from the code,

this->ReportTextBox->Text=Convert::ToString(line);

我知道您在每个循环中用新行替换文本框的当前文本.因此最终您在文本框(最后一行)中将只有一行.如果我确定会有+运算符来附加文本.

I understood that you are replcing the current text of textbox with new line in each loop.So you at the end you will have only one line in textbox(last line).If i am sure there will be + operator to append the text.

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