Question

我遇到了将我的一个表绑定到GridView的问题。我尝试了一切但没有任何帮助。我有一个搜索按钮，我想让它向我显示我的搜索结果，并且我有一个与另一个表绑定的DropDownList。

以下是代码：

SqlConnection my_cn = new SqlConnection("Data Source=NIMA-PC;Initial Catalog=PDFha;Integrated Security=True");
my_cn.Open();
SqlCommand cmd = new SqlCommand("SELECT Books.Name,Books.Subject,Books.PublisherName,Books.Summery FROM Books WHERE (Books.Subject= '" + subList.SelectedValue.ToString() + "') AND (Books.Name= '" + searchName.Text + "')", my_cn);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = cmd;
adapter.Fill(ds);
DataTable dt = ds.Tables[0];
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read()==true)
{
   GridView1.DataSource = dt;
}
my_cn.Close();

单击按钮时没有任何反应我知道我的C＃代码有问题，但我无法识别它。感谢任何评论。

Answer 1

试试这个： - 您缺少DataBind方法，除此之外，我不知道您再次呼叫DataReader的原因，也删除了该代码。另外，请使用参数化查询来阻止SQL Injection。类似于： - cmd.Parameters.AddWithValue()

SqlConnection my_cn = new SqlConnection("Data Source=NIMA-PC;Initial Catalog=PDFha;Integrated Security=True");
my_cn.Open();
SqlCommand cmd = new SqlCommand("SELECT Books.Name,Books.Subject,Books.PublisherName,Books.Summery FROM Books WHERE (Books.Subject= '" + subList.SelectedValue.ToString() + "') AND (Books.Name= '" + searchName.Text + "')", my_cn);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = cmd;
adapter.Fill(ds);
DataTable dt = ds.Tables[0];
GridView1.DataSource = dt;
GridView1.DataBind();
my_cn.Close();

Answer 2

这应该是更正后的代码

SqlConnection my_cn = new SqlConnection("Data Source=NIMA-PC;Initial Catalog=PDFha;Integrated Security=True");
my_cn.Open();
SqlCommand cmd = new SqlCommand("SELECT Books.Name,Books.Subject,Books.PublisherName,Books.Summery FROM Books WHERE (Books.Subject= '" + subList.SelectedValue.ToString() + "') AND (Books.Name= '" + searchName.Text + "')", my_cn);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = cmd;
adapter.Fill(ds);
DataTable dt = ds.Tables[0];
//Modified start
//You don't need SQLReader, While loop
GridView1.DataSource = dt;
GridView1.DataBind();
//Modified End
my_cn.Close();

Answer 3

while (dr.Read()==true)
    {
        GridView1.DataSource = dt;
        GridView1.DataBind();

    }

Answer 4

你错过了这个

GridView1.DataBind（）;

如何绑定gridview？

4 个答案: