StreamWriter语法

Question

我在C# winForms上使用StreamWriter

正如你所看到的，我需要写信息给‘作者’。

我是不是做错了什么，因为'writer‘字段有语法错误？

我收到一条消息说：

"'writer‘是一个'field’，但它的用法与‘type’类似“

有什么想法吗？我的代码如下

 class Booking
    {   
        //what other details do you need to save at the end?...
        public Show bookedShow { get; private set; }
        public Seat selectedSeat { get; private set; }
        public Show selectedShow { get; private set; }
        public Seat finalPrice { get; private set; } //hasnt been defined yet, but this would be the amount of seats selected * the Price

        //i will also need customer details which are:
        public dateAndTime dateTime { get; private set; }
        public Customer custName { get; private set; }
        public Customer custAddress { get; private set; }
        public Customer custTelephone { get; private set; }

        System.IO.StreamWriter writer = new System.IO.StreamWriter(@"C:\BookingInfo.txt"); //open the file for writing.               
        writer.Write(dateTime.ToString()); //write the current date to the file. change this with your date or something.
        writer.write(bookedShow.ToString());
        writer.write(selectedShow.ToString());
        writer.write(selectedSeat.ToString());
        writer.write(finalPrice.ToString());
        writer.write(custName.ToString());
        writer.write(custAddress.ToString());
        writer.write(custTelephone.ToString());
        writer.Close();

    }

Answer 1

字段上的语句不能不在方法(构造函数或其他方法)中。

class Booking
{   
    //what other details do you need to save at the end?...
    public Show bookedShow { get; private set; }
    public Seat selectedSeat { get; private set; }
    public Show selectedShow { get; private set; }
    public Seat finalPrice { get; private set; } //hasnt been defined yet, but this would be the amount of seats selected * the Price

    //i will also need customer details which are:
    public dateAndTime dateTime { get; private set; }
    public Customer custName { get; private set; }
    public Customer custAddress { get; private set; }
    public Customer custTelephone { get; private set; }

    public void MyMethod()
    {
      System.IO.StreamWriter writer = new System.IO.StreamWriter(@"C:\BookingInfo.txt"); //open the file for writing.               
      writer.Write(dateTime.ToString()); //write the current date to the file. change this with your date or something.
      writer.Write(bookedShow.ToString());
      writer.Write(selectedShow.ToString());
      writer.Write(selectedSeat.ToString());
      writer.Write(finalPrice.ToString());
      writer.Write(custName.ToString());
      writer.Write(custAddress.ToString());
      writer.Write(custTelephone.ToString());
      writer.Close();
    }
 }

您还应该注意使用正确的大小写- writer.write不存在，而writer.Write存在。

在我的示例中，我将writer声明为MyMethod方法的局部变量。

阅读有关C#字段here的信息。

Answer 2

如果您希望在“创建”类时运行该函数，请使用构造函数：

public Booking()
{
        using (System.IO.StreamWriter writer = new System.IO.StreamWriter(@"C:\BookingInfo.txt")) //open the file for writing.             
        { 
                writer.Write(dateTime.ToString()); //write the current date to the file. change this with your date or something.
                writer.Write(bookedShow.ToString());
                writer.Write(selectedShow.ToString());
                writer.Write(selectedSeat.ToString());
                writer.Write(finalPrice.ToString());
                writer.Write(custName.ToString());
                writer.Write(custAddress.ToString());
                writer.Write(custTelephone.ToString());
        }
}

也可以使用using语句来正确地处理流。

EDIT:除非你对Stream有特殊的渴望，否则你可以使用File类的静态WriteAllText方法：

public Booking()
{
    File.WriteAllText(@"C:\BookingInfo.txt", string.Concat(dateTime, bookedShow, selectedShow, selectedSeat, finalPrice, custName, custAddress, custTelephone));
}

通过这种方式，您不必担心关闭/处理，也不必调用每个类的ToString()方法，因为它将通过使用Concat自动完成。

Answer 3

首先，你有不属于任何方法的代码，就像Oded回答的那样。

其次，您的Write()是正确的，但write() (小写的第一个字母)不正确。