Aspx代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="SearchCustomer.aspx.cs" Inherits="WebApplication1.eyeofheaven.SearchCustomer" %>
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<link rel="stylesheet" type="text/css" href="StyleSheets/SearchCustomerStyle.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<title>Search Customer</title>
</head>
<body>
<form id="form1" runat="server">
<div class="row">
<div class="twelve columns">
<!-- Header-->
<div class="container">
<nav role="navigation" class="navbar navbar-inverse navbar-fixed-top">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!-- Collection of nav links, forms, and other content for toggling -->
<div id="navbarCollapse" class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li><a href="EyeOfHeaven.aspx">Home</a></li>
<li class="dropdown">
<a data-toggle="dropdown" class="dropdown-toggle active" href="#">Search<b class="caret"></b></a>
<ul role="menu" class="dropdown-menu">
<li><a href="SearchCustomer.aspx">Search Form(Customer)</a></li>
<li><a href="SearchVehicle.aspx">Search Form(Vehicle)</a></li>
</ul>
</li>
</ul>
</div>
</nav>
</div>
</div>
</div>
<!-- Search form customer-->
<div id="searchcustomer" class="page-header">
<h3><span class="glyphicon glyphicon-th-large"></span>Search Customer</h3>
</div>
<div class="row">
<div class="col-md-4">
<input type="text" runat="server" id="search" size="20" class="form-control" placeholder="Customer ID">
</div>
<div class="col-md-4">
<select class="form-control" runat="server" id="Country">
<option value="select" selected disabled>Search by Country</option>
<option value="A:C ESTUDIO">A:C ESTUDIO</option>
<option value="Aaron McEwen-194712">Aaron McEwen-194712</option>
<option value="Accra">Accra</option>
<option value="Adoany">Adoany</option>
<option value="Aduanas">Aduanas</option>
<option value="Alex Sanchez-259029">Alex Sanchez-259029</option>
<option value="ALG Consulting-288078">ALG Consulting-288078</option>
<option value="Algeria">Algeria</option>
<option value="Algimantas Ramaskevicius">Algimantas Ramaskevicius</option>
</select>
</div>
<div class="col-md-4">
<select class="form-control" runat="server" id="Currency">
<option value="selected" selected disabled>Search by Currency</option>
<option value="AUD">AUD (Australian Dollar)</option>
<option value="EUR">EUR (Euro)</option>
<option value="GBP">GBP (United Kingdom Pounds)</option>
<option value="JPY">JPY (Japan Yen)</option>
<option value="NZD">NZD (New Zealand Dollar)</option>
</select>
</div>
</div>
<div class="row">
<div class="col-md-4">
<button type="button" runat="server" onserverclick="Button1_Click" id="searchinfo" class="btn btn-primary"><span class="glyphicon glyphicon-search"></span> Search Info</button>
<button type="button" runat="server" onserverclick="Button2_Click" id="Button2" class="btn btn-danger"><span class="glyphicon glyphicon-repeat"></span>Reset</button>
</div>
</div>
<!-- Information Table-->
<div id="gridview">
<asp:GridView runat="Server" id="data" CssClass="table table-striped table-bordered table-responsive">
</asp:GridView>
</div>
</form>
</body>
</html>
Aspx代码背后：
using MSSQLConnector;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1.eyeofheaven
{
public partial class SearchCustomer : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
MSConnector connector = new MSConnector();
connector.ConnectionString = "SERVER=xbetasql,52292;UID=username;Password=secret;DATABASE=ATDBSQL;";
string customer = (this.search.Value);
string country = (this.Country.Value);
string idcurrency = (this.Currency.Value);
string query = null;
if (country != "select")
{
if (idcurrency != "selected")
{
query = "select * from customer where country = '" + country + "' and idcurrency = '" + idcurrency + "'";
}
else
{
query = "select * from customer where country = '" + country + "'";
}
}
DataSet selectedData = connector.ExecuteQuery(query);
DataTable dt = selectedData.Tables[0];
if (dt.Rows.Count > 0)
{
data.DataSource = dt;
data.DataBind();
}
else
{
Response.Write("<script>alert('No Data Found.')</script>");
}
}
protected void Button2_Click(object sender, EventArgs e, MSConnector connector, string query)
{
DataSet selectedData = connector.ExecuteQuery(query);
DataTable dt = selectedData.Tables.Remove(dt);
this.search.Value = "";
this.Country.Value = "select";
this.Currency.Value = "selected";
}
}
}
我的代码有问题，我想点击Button2_Click作为所有人的重置按钮时从数据集中删除数据表。但是我的代码中有一个错误：
DataTable dt = selectedData.Tables.Remove(dt);
它说“无法将类型'void'隐式转换为'System.Data.DataTable'”
传递我的数据集和数据表是否是Button2_Click（）函数的问题？请帮忙。
答案 0 :(得分：2)
你只需要这个
selectedData.Tables.Remove(dt);
但是，如果您首先检查DataSet是否包含您要删除的表，那会更好。同时检查DataTable是否可以DataSet移除Gianni B。{/ 1}。
if(selectedData.Tables.Contains(dt.name) && selectedData.Tables.CanRemove(dt))
selectedData.Tables.Remove(dt);
Remove方法不返回任何内容。它是return type void您试图通过datatable returned方法分配Remove，而实际上它不会返回任何内容
答案 1 :(得分：2)
你写的行
DataTable dt = selectedData.Tables.Remove(dt);
错误，因为删除方法不会返回任何内容。
因此您需要将代码更改为
selectedData.Tables.Remove(dt);
if(selectedData != null && selectedData.Tables.Count > 0)
{
DataTable dt = selectedData.Tables[0];
}
答案 2 :(得分：0)
试试这个：
DataTable dtDelete = new DataTable();
dtDelete = ds_RecipeData.Tables[0]
if (ds_RecipeData.Tables.Contains(dtDelete.TableName))
if (ds_RecipeData.Tables.CanRemove(dtDelete))
ds_RecipeData.Tables.Remove(dtDelete);