Question

我有一个数据网格视图（为用户输入而设计，然后将其制作成数据库中的数据表）。当我加载表单时，所有内容都按照我的要求加载。但是，如果我退出表单并重新加载它，我收到以下错误消息：

A column named 'line' already belongs to this DataTable

＆＃39;线＆＃39;是我声明的第一个列名;

DataTable dt = new DataTable();
#region loadtable
public void newquoteForm_Load(object sender, EventArgs e)
{
    getCompanyInfo();
    loadTable();
}
private void loadTable()
{
    dt.Clear();
    DataRow dr;
    dt.Columns.Add("Line");
    dt.Columns.Add("Item Name");
    dt.Columns.Add("Item Description");
    dt.Columns.Add("Retail Price");
    dt.Columns.Add("Supplier Number");
    dt.Columns.Add("Quantity Required");
    dt.Columns.Add("In Stock");
    dt.Columns.Add("Cost Price");
    dt.Columns.Add("Total Cost");
    dt.Columns.Add("Total Retail");
    dt.Columns["Line"].AutoIncrement = true;
    dt.Columns["Line"].AutoIncrementSeed = -1;
    dt.Columns["Line"].AutoIncrementStep = 1;
    dt.Columns["Line"].ReadOnly = true;
    dt.Columns["Item Name"].ReadOnly = true;
    dt.Columns["Item Description"].ReadOnly = true;
    dt.Columns["Cost Price"].ReadOnly = true;
    dt.Columns["In Stock"].ReadOnly = true;
    dt.Columns["Retail Price"].ReadOnly = true;
    dt.Columns["Supplier Number"].ReadOnly = true;

    dr = dt.NewRow();
    dataGridView1.DataSource = dt;
}

如何防止这种情况发生？

Answer 1

像这样的Smth

DataTable dt = new DataTable();

public newquoteForm()
{
    InitializeComponent();
    loadTable();
}

public void newquoteForm_Load(object sender, EventArgs e)
{
    getCompanyInfo();
    clearTable();
}

private void clearTable()
{
   DataRow dr;
   dt.Clear();
   dr = dt.NewRow();
   dataGridView1.DataSource = dt;
}

private void loadTable()
{
   dt.Columns.Add("Line");
   dt.Columns.Add("Item Name");
   dt.Columns.Add("Item Description");
   dt.Columns.Add("Retail Price");
   dt.Columns.Add("Supplier Number");
   dt.Columns.Add("Quantity Required");
   dt.Columns.Add("In Stock");
   dt.Columns.Add("Cost Price");
   dt.Columns.Add("Total Cost");
   dt.Columns.Add("Total Retail");
   dt.Columns["Line"].AutoIncrement = true;
   dt.Columns["Line"].AutoIncrementSeed = -1;
   dt.Columns["Line"].AutoIncrementStep = 1;
   dt.Columns["Line"].ReadOnly = true;
   dt.Columns["Item Name"].ReadOnly = true;
   dt.Columns["Item Description"].ReadOnly = true;
   dt.Columns["Cost Price"].ReadOnly = true;
   dt.Columns["In Stock"].ReadOnly = true;
   dt.Columns["Retail Price"].ReadOnly = true;
   dt.Columns["Supplier Number"].ReadOnly = true;
}

重新加载表单时，名为[列名称]的列已属于此DataTable

1 个答案: