原创企业级控件库之组合查询控件
原创企业级控件库之组合查询控件
发布日期：2010年12月10日星期五 作者:EricHu
无论对于企业还是对于软件开发者来说，拥有自己的一套常用控件库，对于开发产品来说不仅可以缩短开发时间，提高开发效率，同时对一个企业整个产品的形象也会大大提高。本系列控件为作者在实际开发应用中总结出来，且成功应用于多个项目。现对整个控件库一一讲解，最后我会把整个控件库开源，方便你的使用，同时会给一个综合应用这些控件的实例。
成就别人、等于成就自己。我没什么要求，欢迎大家多多支持与评论，觉得不错的，记得点击文章左下角的”关注博客”，就这么简单。
整个控件样式如下：
说明:
1、本控件分为组合查询与固定查询两种，上图为组合查询。固定查询见下图。
2、组合查询以下几部份组成：
a. 查询项:设置查询的项目，通俗点就是表中的字段。
b. 运算符:设置查询条件，如:等于、大小、包含、为空等。
c. 值：设置查询的值。
d. 组合方式：当查询条件大于两个时，其组合条件可设为：与方式、或方式、非方式三种。
e. 新增：新增查询条件到组合条件框。
f. 清除：当输入错误时，可以清除组合条件框中的组合查询条件。
g. 查询：当用户单击查询时，返回查询表达式，供用户使用。
h. 固定查询：当用户单击固定查询时，控件变成固定查询控件，同时，固定查询变成“组合查询”，如下图:
3、本控件特点：
a. 对用户输入的危险字符进行了屏蔽，可有效防止对数据库的破坏。
b. 控件返回的查询条件都是合法的Sql语句中的Where条件表达式，可以直接使用。
c. 开放源代码，用户可以根据自己的需要进行定制，消除你的后顾之优。
4、本控件类图如下所示：
5、本控件核心代码
a. 得到组合查询表达式
#region 组合查询表达式
/// <summary>
/// 单击[查询]按钮时发生
/// </summary>
[Category("组合查询"), Description("单击[查询]按钮时发生。"), Browsable(true)]
public event EventHandler OnQueryClicked;
private string _queryExpression;
/// <summary>
/// 最终的查询表达式，可直接用于Where子句中
/// </summary>
[Category("组合查询"), Description("最终的查询表达式，可直接用于Where子句中。"), Browsable(false)]
public string QueryExpression
{
get { return _queryExpression; }
set
{
_queryExpression = value;
if (OnQueryClicked != null)
{
OnQueryClicked(this, null);
}
}
}
#endregion
b. 设置查询项中要显示的数据列表
#region 设置查询项中要显示的数据列表
/// <summary>
/// 设置查询项中要显示的数据列表(推荐使用这个方法)
/// </summary>
/// <param name="dicListQueryItems">表示键和值的集合(键：数据字段，值：数据字段对应的数据类型)</param>
public void SetQueryItems(Dictionary<string, string> dicListQueryItems)
{
cboQueryItems.Items.Clear();
dicQueryItem = null;
dicQueryItem = dicListQueryItems;
foreach (KeyValuePair<string, string> kvp in dicListQueryItems)
{
cboQueryItems.Items.Add(kvp.Key);
}
if (cboQueryItems.Items.Contains("案卷号"))//把案卷号显示在第一个
{
cboQueryItems.Items.Remove("案卷号");
cboQueryItems.Items.Insert(0, "案卷号");
}
cboQueryItems.SelectedIndex = 0;
}
/// <summary>
/// 设置查询项中要显示的数据列表
/// </summary>
/// <param name="sQueryItems">string类型数组</param>
public void SetQueryItems(string[] sQueryItems)
{
cboQueryItems.Items.Clear();
foreach (string queryItem in sQueryItems)
{
cboQueryItems.Items.Add(queryItem);
}
cboQueryItems.SelectedIndex = 0;
}
/// <summary>
/// 设置查询项中要显示的数据列表
/// </summary>
/// <param name="listQueryItems">List泛型</param>
public void SetQueryItems(List<string> listQueryItems)
{
cboQueryItems.Items.Clear();
foreach (string queryItem in listQueryItems)
{
cboQueryItems.Items.Add(queryItem);
}
cboQueryItems.SelectedIndex = 0;
}
#endregion
C．增加查询条件
代码
#region 增加查询条件单击事件 btnAddQueryCondition_Click(object sender, EventArgs e)
private void btnAddQueryCondition_Click(object sender, EventArgs e)
{
if (cboQueryItems.Items.Count == 0)
{
DialogHelper.ShowErrorMsg("查询项为空，不能进行查询！");
return;
}
else
{
string sQueryItem = cboQueryItems.Text.Trim(); //要查询的项
string sQueryValue = txtQueryValue.Text.Trim(); //查询项的值
string sCombinMode = string.Empty; //组合方式
string sQueryExpress = string.Empty;//查询条件表达式
if (cboOperator.Text != "为空" && cboOperator.Text != "不为空")
{
if (string.IsNullOrEmpty(txtQueryValue.Text.Trim()))
{
DialogHelper.ShowWarningMsg("必须输入查询项的值!");
txtQueryValue.Focus();
return;
}
else
{
if (StringHelper.HasDangerousWord(txtQueryValue.Text.Trim()))
{
DialogHelper.ShowWarningMsg("对不起，你的输入含有危险字符，请重新输入！");
txtQueryValue.Clear();
txtQueryValue.Focus();
return;
}
}
}
switch (cboCombinMode.Text)
{
case "与方式":
sCombinMode = "AND";
break;
case "或方式":
sCombinMode = "OR";
break;
case "非方式":
sCombinMode = "AND NOT";
break;
default:
break;
}
#region 条件设置
switch (cboOperator.Text)
{
case "包含":
sQueryExpress = sQueryItem + " LIKE '%" + sQueryValue + "%'";
break;
case "左包含":
sQueryExpress = sQueryItem + " LIKE '" + sQueryValue + "%'";
break;
case "右包含":
sQueryExpress = sQueryItem + " LIKE '%" + sQueryValue + "'";
break;
case "为空":
sQueryExpress = sQueryItem + " IS NULL OR " + sQueryItem + "= ''";
break;
case "不为空":
sQueryExpress = sQueryItem + " IS NOT NULL And " + sQueryItem + "!= ''";
break;
case "大于":
if (dicQueryItem.Count == 0)
{
sQueryExpress = sQueryItem + " > " + sQueryValue;
}
else
{
foreach (KeyValuePair<string, string> kvp in dicQueryItem)
{
if (cboQueryItems.Text == kvp.Key)
{
if ((kvp.Value == "System.DateTime" || kvp.Value == "System.String")
&& kvp.Key != "案卷号") //kvp.Key != "案卷号"主是要因为案卷号是字符型，案卷号>'90',得不到正确结果，所以在此这样做
{
sQueryExpress = sQueryItem + " > '" + sQueryValue + "'";
}
else
{
sQueryExpress = sQueryItem + " > " + sQueryValue;
}
}
}
}
break;
case "大于或等于":
if (dicQueryItem.Count == 0)
{
sQueryExpress = sQueryItem + " >= " + sQueryValue;
}
else
{
foreach (KeyValuePair<string, string> kvp in dicQueryItem)
{
if (cboQueryItems.Text == kvp.Key)
{
if ((kvp.Value == "System.DateTime" || kvp.Value == "System.String") && kvp.Key != "案卷号")
{
sQueryExpress = sQueryItem + " >= '" + sQueryValue + "'";
}
else
{
sQueryExpress = sQueryItem + " >= " + sQueryValue;
}
}
}
}
break;
case "等于":
if (dicQueryItem.Count == 0)
{
sQueryExpress = sQueryItem + " = " + sQueryValue;
}
else
{
foreach (KeyValuePair<string, string> kvp in dicQueryItem)
{
if (cboQueryItems.Text == kvp.Key)
{
//---3
if (kvp.Value == "System.DateTime" || kvp.Value == "System.String")
{
sQueryExpress = sQueryItem + " = '" + sQueryValue + "'";
}
else
{
sQueryExpress = sQueryItem + " = " + sQueryValue;
}
}
}
}
break;
case "小于或等于":
if (dicQueryItem.Count == 0)
{
sQueryExpress = sQueryItem + " <= " + sQueryValue;
}
else
{
foreach (KeyValuePair<string, string> kvp in dicQueryItem)
{
if (cboQueryItems.Text == kvp.Key)
{
if ((kvp.Value == "System.DateTime" || kvp.Value == "System.String") && kvp.Key != "案卷号")
{
sQueryExpress = sQueryItem + " <= '" + sQueryValue + "'";
}
else
{
sQueryExpress = sQueryItem + " <= " + sQueryValue;
}
}
}
}
break;
case "小于":
if (dicQueryItem.Count == 0)
{
sQueryExpress = sQueryItem + " < " + sQueryValue;
}
else
{
foreach (KeyValuePair<string, string> kvp in dicQueryItem)
{
if (cboQueryItems.Text == kvp.Key)
{
if ((kvp.Value == "System.DateTime" || kvp.Value == "System.String") && kvp.Key != "案卷号")
{
sQueryExpress = sQueryItem + " < '" + sQueryValue + "'";
}
else
{
sQueryExpress = sQueryItem + " < " + sQueryValue;
}
}
}
}
break;
default:
break;
}
if (!string.IsNullOrEmpty(txtQueryCondition.Text.Trim()))
{
sQueryExpress = sCombinMode + " " + sQueryExpress;
}
txtQueryCondition.AppendText(" " + sQueryExpress);
#endregion
}
}
#endregion
6、 控件编译后，你可把编译后的dll文件直接拖运到Microsoft Visual Studi工具箱中，就可以看到我们的组合查询控件了。在实际应用中，仅需以下两个步骤即可完成整个代码。
a.在窗体社会分配加载时绑定相应的查询项
代码
/// <summary>
/// 增加测试数据
/// </summary>
private void BindTestData()
{
dtTest = new DataTable();
dtTest.Columns.Add(new DataColumn("身份证号", typeof(System.String)));
dtTest.Columns.Add(new DataColumn("姓名", typeof(System.String)));
dtTest.Columns.Add(new DataColumn("QQ", typeof(System.String)));
dtTest.Columns.Add(new DataColumn("年龄", typeof(System.Int16)));
dtTest.Columns.Add(new DataColumn("出生时间", typeof(System.DateTime)));
}
private void FrmUcCombinQueryTest_Shown(object sender, EventArgs e)
{
BindTestData();
//绑定查询项
Dictionary<string, string> dicListQueryItems = new Dictionary<string, string>();
foreach (DataColumn dc in dtTest.Columns)
{
dicListQueryItems.Add(dc.ColumnName, dc.DataType.ToString());
}
ucCombinQueryTest.SetQueryItems(dicListQueryItems);
}
b.单击查询时，返回给用户的查询表达式，用户直接得到使用，在组合查询的OnQueryClicked事件代码中进行处理。
private
void
ucCombinQueryTest_OnQueryClicked(
object
sender, EventArgs e)
{
// 得到查询表达式
MessageBox.Show(ucCombinQueryTest.QueryExpression);
}
{
// 得到查询表达式
MessageBox.Show(ucCombinQueryTest.QueryExpression);
}
7、下面给出组合查询控件完整代码
#region 版权信息 /*---------------------------------------------------------------------* // Copyright (C) 2008 http://www.cnblogs.com/huyong // 版权所有。 // 项目 名称：《Winform通用控件库》 // 文 件 名： UcCombinQuery.cs // 类 全 名： DotNet.Controls.UcCombinQuery // 描 述: 组合查询控件 // 创建 时间： 2008-08-05 // 创建人信息： [**** 姓名:胡勇 QQ:406590790 E-Mail:[email protected] *****] *----------------------------------------------------------------------*/ #endregion using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Text; using System.Windows.Forms; using DotNet.Common; namespace DotNet.Controls { /// <summary> /// 组合查询控件 /// UcCombinQuery /// 修改纪录 /// 2010-12-6 胡勇 优化相关代码。 /// 2010-11-29 胡勇 取消对：清除组合查询条件时的提示。 /// 2010-11-8 胡勇 要是查询项中包含"案卷号",则把案卷号移动到第一个查询项。 /// 2010-11-5 胡勇 对案卷号的查询，不加单引号。 /// 2010-8-30 胡勇 对查询字符型字段进行>、<、>=、<=、=操作时，其值自动加单引号。 /// 2008-08-05 胡勇 创建组合查询控件 /// <author> /// <name>胡勇</name> /// <QQ>406590790</QQ> /// <Email>[email protected]</Email> /// </author> /// </summary> [ToolboxItem(true)] [DefaultEvent("OnQueryClicked")] [ToolboxBitmap(typeof(UcCombinQuery), "DotNet.Controls.Images.UcCombinQuery.bmp")] [Description("组合查询控件")] public partial class UcCombinQuery : UserControl { #region 公共变量 Dictionary<string, string> dicQueryItem = new Dictionary<string, string>(); #endregion #region 公共方法 /// <summary> /// 查询模式 /// </summary> public enum QueryMode { /// <summary> /// 固定查询 /// </summary> FixQueryMode = 0x0001, /// <summary> /// 组合查询 /// </summary> CompositeQueryMode = 0x0002 } /// <summary> /// 设置查询模式 /// </summary> /// <param name="queryMode">查询模式</param> public void SetQueryMode(QueryMode queryMode) { if (queryMode == QueryMode.FixQueryMode) { btnQueryMode.Text = "固定查询"; } else { btnQueryMode.Text = "组合查询"; } btnQueryMode_Click(null, null); } #endregion #region 可见性属性 private bool _QueryModeButtomVisible = true; /// <summary> /// 组合查询按钮是否可见 /// </summary> [Category("组合查询"), Description("组合查询是否可见。")] public bool QueryModeButtomVisible { get { return _QueryModeButtomVisible; } set { _QueryModeButtomVisible = value; if (!_QueryModeButtomVisible) { toolStripSeparator1.Visible = false; } this.btnQueryMode.Visible = _QueryModeButtomVisible; } } #endregion #region 构造函数 public UcCombinQuery() { InitializeComponent(); } #endregion #region 组合查询表达式 /// <summary> /// 单击[查询]按钮时发生 /// </summary> [Category("组合查询"), Description("单击[查询]按钮时发生。"), Browsable(true)] public event EventHandler OnQueryClicked; private string _queryExpression; /// <summary> /// 最终的查询表达式，可直接用于Where子句中 /// </summary> [Category("组合查询"), Description("最终的查询表达式，可直接用于Where子句中。"), Browsable(false)] public string QueryExpression { get { return _queryExpression; } set { _queryExpression = value; if (OnQueryClicked != null) { OnQueryClicked(this, null); } } } #endregion #region 查询项相关控制 #region 设置查询项中要显示的数据列表 /// <summary> /// 设置查询项中要显示的数据列表(推荐使用这个方法) /// </summary> /// <param name="dicListQueryItems">表示键和值的集合(键：数据字段，值：数据字段对应的数据类型)</param> public void SetQueryItems(Dictionary<string, string> dicListQueryItems) { cboQueryItems.Items.Clear(); dicQueryItem = null; dicQueryItem = dicListQueryItems; foreach (KeyValuePair<string, string> kvp in dicListQueryItems) { cboQueryItems.Items.Add(kvp.Key); } if (cboQueryItems.Items.Contains("案卷号"))//把案卷号显示在第一个 { cboQueryItems.Items.Remove("案卷号"); cboQueryItems.Items.Insert(0, "案卷号"); } cboQueryItems.SelectedIndex = 0; } /// <summary> /// 设置查询项中要显示的数据列表 /// </summary> /// <param name="sQueryItems">string类型数组</param> public void SetQueryItems(string[] sQueryItems) { cboQueryItems.Items.Clear(); foreach (string queryItem in sQueryItems) { cboQueryItems.Items.Add(queryItem); } cboQueryItems.SelectedIndex = 0; } /// <summary> /// 设置查询项中要显示的数据列表 /// </summary> /// <param name="listQueryItems">List泛型</param> public void SetQueryItems(List<string> listQueryItems) { cboQueryItems.Items.Clear(); foreach (string queryItem in listQueryItems) { cboQueryItems.Items.Add(queryItem); } cboQueryItems.SelectedIndex = 0; } #endregion /// <summary> /// 设置查询项的选择索引项 /// </summary> /// <param name="index">索引的下标</param> public void SetQueryItemsSelectIndex(int index) { this.cboQueryItems.SelectedIndex = index; } /// <summary> /// 设置查询项的选择内容 /// </summary> /// <param name="sTxt">查询项选中的内容</param> public void SetQueryItemSelectText(string sTxt) { this.cboQueryItems.SelectedText =sTxt; } /// <summary> /// 清空选项值 /// </summary> public void ClearQueryItems() { cboQueryItems.Items.Clear(); } #endregion #region 事件代码 #region 窗体Load事件 UcCombinQuery_Load(object sender, EventArgs e) private void UcCombinQuery_Load(object sender, EventArgs e) { this.Height = 25; } #endregion #region 设置查询模式(组合查询或固定查询:btnQueryMode_Click(object sender, EventArgs e) private void btnQueryMode_Click(object sender, EventArgs e) { cboQueryItems.Focus(); //spContainerHorizontal.Panel2Collapsed = !spContainerHorizontal.Panel2Collapsed; lblOperator.Visible = !lblOperator.Visible; cboOperator.Visible = !cboOperator.Visible; lblCombinMode.Visible = !lblCombinMode.Visible; cboCombinMode.Visible = !cboCombinMode.Visible; sp1.Visible = !sp1.Visible; if (btnQueryMode.Text == "固定查询") { btnQueryMode.Text = "组合查询"; btnAddQueryCondition.Visible = !btnAddQueryCondition.Visible; btnClsQueryCondition.Visible = !btnClsQueryCondition.Visible; this.Height = 25; btnQueryMode.Image = DotNet.Controls.Properties.Resources.组合查询;//导入图片 } else if (btnQueryMode.Text == "组合查询") { txtQueryCondition.Clear(); cboOperator.SelectedIndex = 0; cboCombinMode.SelectedIndex = 0; btnAddQueryCondition.Visible = !btnAddQueryCondition.Visible; btnClsQueryCondition.Visible = !btnClsQueryCondition.Visible; this.Height = 86; btnQueryMode.Text = "固定查询"; btnQueryMode.Image = DotNet.Controls.Properties.Resources.固定查询; } } #endregion #region 增加查询条件单击事件 btnAddQueryCondition_Click(object sender, EventArgs e) private void btnAddQueryCondition_Click(object sender, EventArgs e) { if (cboQueryItems.Items.Count == 0) { DialogHelper.ShowErrorMsg("查询项为空，不能进行查询！"); return; } else { string sQueryItem = cboQueryItems.Text.Trim(); //要查询的项 string sQueryValue = txtQueryValue.Text.Trim(); //查询项的值 string sCombinMode = string.Empty; //组合方式 string sQueryExpress = string.Empty;//查询条件表达式 if (cboOperator.Text != "为空" && cboOperator.Text != "不为空") { if (string.IsNullOrEmpty(txtQueryValue.Text.Trim())) { DialogHelper.ShowWarningMsg("必须输入查询项的值!"); txtQueryValue.Focus(); return; } else { if (StringHelper.HasDangerousWord(txtQueryValue.Text.Trim())) { DialogHelper.ShowWarningMsg("对不起，你的输入含有危险字符，请重新输入！"); txtQueryValue.Clear(); txtQueryValue.Focus(); return; } } } switch (cboCombinMode.Text) { case "与方式": sCombinMode = "AND"; break; case "或方式": sCombinMode = "OR"; break; case "非方式": sCombinMode = "AND NOT"; break; default: break; } #region 条件设置 switch (cboOperator.Text) { case "包含": sQueryExpress = sQueryItem + " LIKE '%" + sQueryValue + "%'"; break; case "左包含": sQueryExpress = sQueryItem + " LIKE '" + sQueryValue + "%'"; break; case "右包含": sQueryExpress = sQueryItem + " LIKE '%" + sQueryValue + "'"; break; case "为空": sQueryExpress = sQueryItem + " IS NULL OR " + sQueryItem + "= ''"; break; case "不为空": sQueryExpress = sQueryItem + " IS NOT NULL And " + sQueryItem + "!= ''"; break; case "大于": if (dicQueryItem.Count == 0) { sQueryExpress = sQueryItem + " > " + sQueryValue; } else { foreach (KeyValuePair<string, string> kvp in dicQueryItem) { if (cboQueryItems.Text == kvp.Key) { if ((kvp.Value == "System.DateTime" || kvp.Value == "System.String") && kvp.Key != "案卷号") //kvp.Key != "案卷号"主是要因为案卷号是字符型，案卷号>'90',得不到正确结果，所以在此这样做 { sQueryExpress = sQueryItem + " > '" + sQueryValue + "'"; } else { sQueryExpress = sQueryItem + " > " + sQueryValue; } } } } break; case "大于或等于": if (dicQueryItem.Count == 0) { sQueryExpress = sQueryItem + " >= " + sQueryValue; } else { foreach (KeyValuePair<string, string> kvp in dicQueryItem) { if (cboQueryItems.Text == kvp.Key) { if ((kvp.Value == "System.DateTime" || kvp.Value == "System.String") && kvp.Key != "案卷号") { sQueryExpress = sQueryItem + " >= '" + sQueryValue + "'"; } else { sQueryExpress = sQueryItem + " >= " + sQueryValue; } } } } break; case "等于": if (dicQueryItem.Count == 0) { sQueryExpress = sQueryItem + " = " + sQueryValue; } else { foreach (KeyValuePair<string, string> kvp in dicQueryItem) { if (cboQueryItems.Text == kvp.Key) { //---3 if (kvp.Value == "System.DateTime" || kvp.Value == "System.String") { sQueryExpress = sQueryItem + " = '" + sQueryValue + "'"; } else { sQueryExpress = sQueryItem + " = " + sQueryValue; } } } } break; case "小于或等于": if (dicQueryItem.Count == 0) { sQueryExpress = sQueryItem + " <= " + sQueryValue; } else { foreach (KeyValuePair<string, string> kvp in dicQueryItem) { if (cboQueryItems.Text == kvp.Key) { if ((kvp.Value == "System.DateTime" || kvp.Value == "System.String") && kvp.Key != "案卷号") { sQueryExpress = sQueryItem + " <= '" + sQueryValue + "'"; } else { sQueryExpress = sQueryItem + " <= " + sQueryValue; } } } } break; case "小于": if (dicQueryItem.Count == 0) { sQueryExpress = sQueryItem + " < " + sQueryValue; } else { foreach (KeyValuePair<string, string> kvp in dicQueryItem) { if (cboQueryItems.Text == kvp.Key) { if ((kvp.Value == "System.DateTime" || kvp.Value == "System.String") && kvp.Key != "案卷号") { sQueryExpress = sQueryItem + " < '" + sQueryValue + "'"; } else { sQueryExpress = sQueryItem + " < " + sQueryValue; } } } } break; default: break; } if (!string.IsNullOrEmpty(txtQueryCondition.Text.Trim())) { sQueryExpress = sCombinMode + " " + sQueryExpress; } txtQueryCondition.AppendText(" " + sQueryExpress); #endregion } } #endregion #region 清除查询条件 btnClsQueryCondition_Click(object sender, EventArgs e) //清除查询条件 private void btnClsQueryCondition_Click(object sender, EventArgs e) { if (txtQueryCondition.Text.Trim() != string.Empty) { txtQueryCondition.Clear(); } } #endregion #region 查询单击事件 btnQuery_Click(object sender, EventArgs e) private void btnQuery_Click(object sender, EventArgs e) { if (cboQueryItems.Items.Count == 0) { DialogHelper.ShowErrorMsg("查询项为空！"); return; } else { if (btnQueryMode.Text == "组合查询") { if (string.IsNullOrEmpty(txtQueryValue.Text.Trim())) { QueryExpression = "1 = 1"; return; } else { if (StringHelper.HasDangerousWord(txtQueryValue.Text.Trim())) //危险字符判断 { DialogHelper.ShowWarningMsg("对不起，你的输入包含危险字符，请重新输入！"); txtQueryValue.Clear(); txtQueryValue.Focus(); return; } else { if (dicQueryItem.Count == 0) { QueryExpression = cboQueryItems.Text + " = '" + txtQueryValue.Text.Trim() + "'";//精确查询 } else { foreach (KeyValuePair<string, string> kvp in dicQueryItem) { if (cboQueryItems.Text == kvp.Key) { if (kvp.Value == "System.DateTime") { QueryExpression = cboQueryItems.Text + " = '" + txtQueryValue.Text.Trim() + "'";//精确查询 } else { QueryExpression = cboQueryItems.Text + " = '" + txtQueryValue.Text.Trim() + "'";//精确查询 } } } } } } } else { if (string.IsNullOrEmpty(txtQueryCondition.Text.Trim())) { if (cboOperator.Text != "为空" && cboOperator.Text != "不为空") { if (txtQueryValue.Text.Trim() == string.Empty) { DialogHelper.ShowWarningMsg("必须输入查询项的值!"); txtQueryValue.Focus(); return; } else { if (StringHelper.HasDangerousWord(txtQueryValue.Text.Trim())) { DialogHelper.ShowWarningMsg("对不起，你的输入含有危险字符，请重新输入！"); txtQueryValue.Clear(); txtQueryValue.Focus(); return; } else { btnAddQueryCondition_Click(sender, e); } } } else { btnAddQueryCondition_Click(sender, e); } } QueryExpression = txtQueryCondition.Text.Trim(); } } } #endregion #endregion } }