Question

第一次尝试在c＃中构建csv文件时，代码如下：

string FilePath = @"C:\Users\me\Downloads\csvfiles\test-" + DateTime.Now.ToString("dd-MM-yyyy-hh-mm-ss") + ".csv";
string delimit = ",";
List<string> cells = new List<string>();

Console.WriteLine("Gathering the data...");

SqlConnection con = new SqlConnection(Properties.Settings.Default.ConnectionString);
con.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = "SELECT id, name FROM contacts";

SqlDataReader reader = cmd.ExecuteReader();

Console.WriteLine("Building the csv file");

while (reader.Read())
{
    AddCell((IDataRecord)reader, cells);
}

StringBuilder sb = new StringBuilder();

for (int i = 0; i < cells.Count; i++)
{
    sb.AppendLine(string.Join(delimit, cells[i]));
}

File.WriteAllText(FilePath, sb.ToString());

/*Method to add each record to the list*/
public static void AddCell(IDataRecord record, List<string> cells)
{
    cells.Add(record[0].ToString());
    cells.Add(record[1].ToString());
}

麻烦的是，它将所有内容附加到新行，它不会将记录[1]移动到下一列并开始新行......

Answer 1

您的For循环对于您要执行的操作不正确。

替换：

    for (int i = 0; i < cells.Count; i++)
    {
         sb.AppendLine(string.Join(delimit, cells[i]));
    }

使用

    int i = 0;
    while (i < cells.Count)
    {
       sb.AppendLine(string.Join(delimit, cells[i],cells[i+1]));
       i = i + 2;
    }

Answer 2

string FilePath = @"C:\Users\me\Downloads\csvfiles\test-" + DateTime.Now.ToString("dd-MM-yyyy-hh-mm-ss") + ".csv";
string delimit = ",";
List<string> cells = new List<string>();

Console.WriteLine("Gathering the data...");

SqlConnection con = new SqlConnection(Properties.Settings.Default.ConnectionString);
con.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = System.Data.CommandType.Text;
cmd.CommandText = "SELECT id, name FROM contacts";

SqlDataReader reader = cmd.ExecuteReader();

Console.WriteLine("Building the csv file");

while (reader.Read())
{
    AddCell((IDataRecord)reader, cells);
}

StringBuilder sb = new StringBuilder();

for (int i = 0; i < cells.Count; i++)
{
    if (cells[i].Equals("\n"))
    {
        sb.Append(Environment.NewLine);
    }
    else
    {
        sb.Append(cells[i]);
    }
}

File.WriteAllText(FilePath, sb.ToString());

/*Method to add each record to the list*/
public static void AddCell(IDataRecord record, List<string> cells)
{
    cells.Add(record[0].ToString());
    cells.Add(",");
    cells.Add(record[1].ToString());
    cells.Add("\n");
}

不像你的@cvraman那么优雅，但它也有效:)我将使用你的解决方案。

创建csv文件，而不是添加到下一列

2 个答案: