更改for循环中的条件

问题描述

foreach (GridViewRow row in GridView1.Rows)
{
  if (GridView1.Rows[i - 1].Cells[4].Text == "SFG")
  {
    DataTable dt2 = new DataTable();
    System.Data.OleDb.OleDbCommand sqlCmd = new System.Data.OleDb.OleDbCommand("SELECT * FROM BOM1_HH WHERE MODEL_NAME='" + GridView1.Rows[i - 1].Cells[2].Text + "'", (System.Data.OleDb.OleDbConnection)Session["CON"]);
    System.Data.OleDb.OleDbDataAdapter sqlDa = new System.Data.OleDb.OleDbDataAdapter(sqlCmd);
    sqlDa.Fill(dt2);
    ((DataTable)GridView1.DataSource).Merge(dt2);
    GridView1.DataSource = (DataTable)GridView1.DataSource;
    GridView1.DataBind();
  }
  i++;
}

推荐答案

for(int rowIndex = 1; rowIndex < GridView1.Rows.Count; i++)
{
    if(GridView1.Rows[i - 1].Cells[4].Text == "Whatever")
    {
        DoSomething(GridView1.Rows[i - 1]);
    }
}

但是你为什么要在 1 而不是通常的开始你的迭代> 0 然后总是使用 i - 1 ？是否有更多的代码实际上使用 i 对两个相邻的行做某事？



否则你会更好从 0 开始，只使用 i 。

或者完全忘记迭代变量使用问题代码中的行变量。

But why would you want to start your iteration at 1 instead of the usual 0 and then always use i - 1? Is there more code that acutally uses i to do something to two adjacent rows?

Otherwise you would be better off starting at 0 and using just i.
Or forget about iteration variables altogether and use the row variable from your question's code.

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