各位大哥！这什么地方做错了？必须声明标量变量@***

C# code

       public static DataSet Search(Entity.WeaponInfo Search)       {           SqlConnection conn = new SqlConnection("Server=.; Integrated Security=True; Database=WeaponSalesMng");           SqlCommand cmd = new SqlCommand("select * from WeapInfo where WeapName=@WeapName", conn);           cmd.Parameters.Add(new SqlParameter("@WeapName", Search.Name));           conn.Open();           DataSet ds = new DataSet();           SqlDataAdapter da = new SqlDataAdapter(cmd.CommandText, conn);           da.Fill(ds,"WeapInfo");//在这里提示必须声明标量变量@WeapName           da.FillSchema(ds, SchemaType.Source, "WeapInfo");           DataTable table = ds.Tables["WeapInfo"];           conn.Close();           return ds;       }

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我将"select * from WeapInfo where WeapName=@WeapName" 换成"select * from WeapInfo where WeapName='XXX'"就可以正常运行
但是Search.Name 确实有值传进来了啊 。。。。
各位老大教教我啊

[解决办法]
SqlDataAdapter da = new SqlDataAdapter(cmd.CommandText, conn);
改成
SqlDataAdapter da = new SqlDataAdapter(cmd);
[解决办法]

探讨

试试
cmd.Parameters.AddWithValue("@WeapName", Search.Name);

[解决办法]

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引用:

SqlDataAdapter da = new SqlDataAdapter(cmd.CommandText, conn);
改成
SqlDataAdapter da = new SqlDataAdapter(cmd);


谢谢你，解决了 为什么我的写法不行呢？