C#生成csv文件的方法

简版：

string filePath = @"E:\C#\CSV操作\person.csv";  //文件路径

System.IO.FileInfo fi = new System.IO.FileInfo(filePath);
if (!fi.Directory.Exists)
{
    fi.Directory.Create();  //文件不存在，创建文件
}

System.IO.FileStream fs = new System.IO.FileStream(filePath,System.IO.FileMode.Create,System.IO.FileAccess.Write);  
System.IO.StreamWriter sw = new System.IO.StreamWriter(fs, System.Text.Encoding.UTF8);

//写入列名
string data = "姓名,年龄";
sw.WriteLine(data);

//写入行数据
data = "小李,12";
sw.WriteLine(data);
data = "小王,18";
sw.WriteLine(data);
data = "小刚,20";
sw.WriteLine(data);

sw.Close();
fs.Close();

通过Datatable操作

public static void SaveCSV(DataTable dt, string filePath)//table数据写入csv
        {
            System.IO.FileInfo fi = new System.IO.FileInfo(fullPath);
            if (!fi.Directory.Exists)
            {
                fi.Directory.Create();
            }
            System.IO.FileStream fs = new System.IO.FileStream(fullPath, System.IO.FileMode.Create,System.IO.FileAccess.Write);
            System.IO.StreamWriter sw = new System.IO.StreamWriter(fs, System.Text.Encoding.UTF8);

            //写入列名
            string data = "";
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                data += dt.Columns[i].ColumnName.ToString();
                if (i < dt.Columns.Count - 1)
                {
                    data += ",";
                }
            }
            sw.WriteLine(data);

            //写入各行数据
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                data = "";
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    string str = dt.Rows[i][j].ToString();
                    str = str.Replace("\"", "\"\"");//替换英文冒号 英文冒号需要换成两个冒号
                    if (str.Contains(',') || str.Contains('"')
                      || str.Contains('\r') || str.Contains('\n')) //含逗号 冒号 换行符的需要放到引号中
                    {
                        str = string.Format("\"{0}\"", str);
                    }

                    data += str;
                    if (j < dt.Columns.Count - 1)
                    {
                        data += ",";
                    }
                }
                sw.WriteLine(data);
            }
            sw.Close();
            fs.Close();
        }