将循环变量追加到变量名 [英] Append Loop Variable to Variable Name

问题描述

我有5个数据表需要转换为TXT文件。我没有单独创建它们，而是以为我使用了 for 循环。这是我的代码：

I have 5 DataTables that needs to be converted to TXT files. Instead of creating them separately, I thought I use a for loop. Here's my code:

StringBuilder sb = new StringBuilder();
for (int i = 1; i < 5; i++)
{
    DataTable dtFile1 = file1BLO.SelectFile1ForCSV()
    foreach (DataRow dr in dtFile1.Rows)
    {
        string[] fields = dr.ItemArray.Select(field => field.ToString()).ToArray();
        sb.AppendLine(string.Join("|", fields) + "|");
    }
    Response.ContentType = "application/text";
    Response.AddHeader("content-disposition", "attachment;filename=CAPRES-FILE1-"
                + DateTime.Now.ToString("yyyyMMdd-HHmmss") + ".txt");
    Response.Output.Write(sb);
    Response.Flush();
    Response.End();
    sb.Clear();
}

我希望将迭代器附加到变量名和方法之后。像这样的 DataTable dtFile + i = file + i + BLO.SelectFile + i + ForCSV（）;

I would want the iterator to be appended to the variable names and methods. Like this DataTable dtFile + i = file + i + BLO.SelectFile + i + ForCSV();

谢谢！

SelectFile1ForCSV（）的请求代码

Requested Code for SelectFile1ForCSV()

public DataTable SelectFile1ForCSV()
{
    return file1DAO.SelectFile1ForCSV();
}

编辑：很抱歉，似乎我没有提供足够的详细信息，我的问题引起了混乱。立即编辑。

I am sorry, it seems that I haven't provided enough details, and my question has caused confusion. Edited now.

推荐答案

您不能只在运行时将数字附加到变量名上以神奇地引用新变量。相反，您应该做的是：

You cannot just append a number to a variable name at runtime to magically reference a new variable. What you should do instead is:

定义一个接口：

public interface IFileBLO
{
    DataTable SelectFileForCSV();
}

具有 File1BLO ， File2BLO 等都实现了 IFileBLO 并修复方法名称，以使它们全部为 SelectFileForCSV 而不是 SelectFile1ForCSV 等。

Have File1BLO, File2BLO etc all implement IFileBLO and fix the method names so that they are all SelectFileForCSV rather than SelectFile1ForCSV etc.

添加查找以引用这些对象：

Add a lookup for reference these objects:

var bloList = new IFileBLO[]
{
    file1BLO, file2BLO, file3BLO, file4BLO, file5BLO
};

最后，将循环更改为：

for (int i = 0; i < 5; i++)
{
    var dtFile = bloList[i].SelectFileForCSV();
    foreach (var dr in dtFile.Rows)
    {
        ...

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