c#操作excel方式一:stream简单读写excel

需要命名空间

using System.IO;

界面:

记得添加openFileDialog

注意名字,改成跟代码里的对应

写文件按钮代码:

  private void button2_Click(object sender, EventArgs e)
        {
            int i = 0;
            StreamWriter aFile = null;
            aFile = File.CreateText("aFile .csv");
          
         
           
         //aFile.WriteLine(i.ToString() + "," + (i + 1).ToString() + "," + (i + 2));
          aFile.WriteLine("\"" + i.ToString() + "," + (i + 1).ToString() + "," + (i + 2)+"\"");
         //aFile.WriteLine("\""+i.ToString() + "," + (i + 1).ToString() +"\""+ "," + (i + 2));
            aFile.Close();
                aFile.Dispose();
                MessageBox.Show("end!");
        }

注意逗号分隔符的用法,逗号分隔符把内容分成几个单元格.

如果要在同一个单元格中写入逗号,则要在该单元格内容前后加上双引号加上,3种情况产生的格式如下:

aFile.WriteLine(i.ToString() + "," + (i + 1).ToString() + "," + (i + 2));

aFile.WriteLine("\"" + i.ToString() + "," + (i + 1).ToString() + "," + (i + 2)+"\"");

aFile.WriteLine("\""+i.ToString() + "," + (i + 1).ToString() +"\""+ "," + (i + 2));

读文件按钮按钮:

  private void button1_Click(object sender, EventArgs e)
        {
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                string str = null;

                FileStream fs = new FileStream(openFileDialog.FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
                StreamReader reader = new StreamReader(fs, System.Text.Encoding.UTF8);
                while ((str = reader.ReadLine()) != null)
                {


                    // split the string
                    //MessageBox.Show(str);
                    string[] strs = str.Split(',');
                    string show_str = "";
                    for(int i=0;i<strs.Length;i++)
                    {
                        if (i == strs.Length-1)
                        {
                            show_str += strs[i].ToString();
                        }
                        else
                        {
                            show_str += strs[i].ToString() + ",";
                        }
                    }
                    this.label1.Text = show_str;
                }
                reader.Close();
            }
        }

上面三种写入方式读出的字符串对应如下：

对应读出的字符串:

str=0,1,2

即strs[0]=0

strs[1]=1

strs[2]=2

对应的字符串:

str="0,1,2",

即strs[0]="0

strs[1]=1

strs[2]=2"

对应的字符串:

str="0,1",2,

即strs[0]="0

 strs[1]=1"

strs[2]=2