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c# wpf 表单更改提示

内容目录

1. 实现效果
2. 业务场景
3. 编码实现
4. 本文参考
5. 源码下载

1.实现效果

未做修改的表单展示

表单变化，关闭窗体提示

来个gif动态操作看看

2.业务场景

表单修改后，关闭窗体前检查提示

3.编码实现

3.1 添加nuget库

使用 .net core 3.1 创建名为“validatedatachange”的wpf解决方案，添加两个nuget库：materialdesignthemes和materialdesigncolors。

materialdesign控件库

3.2 工程结构

4个文件变动：

1. app.xaml：添加md控件样式
2. mainwindow.xaml：主窗口实现效果
3. mainwindow.xaml.cs：主窗口后台绑定及关闭验证
4. contact.cs：绑定的实体

3.3 app.xaml引入md控件样式

<application x:class="validatedatachange.app"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:validatedatachange"
             startupuri="mainwindow.xaml">
    <application.resources>
        <resourcedictionary>
            <resourcedictionary.mergeddictionaries>
                <resourcedictionary source="pack://application:,,,/materialdesignthemes.wpf;component/themes/materialdesigntheme.light.xaml"/>
                <resourcedictionary source="pack://application:,,,/materialdesignthemes.wpf;component/themes/materialdesigntheme.defaults.xaml"/>
                <resourcedictionary source="pack://application:,,,/materialdesigncolors;component/themes/recommended/primary/materialdesigncolor.deeppurple.xaml"/>
                <resourcedictionary source="pack://application:,,,/materialdesigncolors;component/themes/recommended/accent/materialdesigncolor.blue.xaml"/>
            </resourcedictionary.mergeddictionaries>
        </resourcedictionary>
    </application.resources>
</application>

3.4 主窗体 mainwindow.xaml

表单展示，使用md控件的snackbar作为消息提示

<window x:class="validatedatachange.mainwindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:validatedatachange"
        mc:ignorable="d"
        xmlns:materialdesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        title="编辑联系人" height="500" width="400" resizemode="noresize" fontfamily="roboto" 
        fontsize="14" windowstartuplocation="centerscreen" closing="window_closing">
    <grid>
        <grid.rowdefinitions>
            <rowdefinition height="100"/>
            <rowdefinition height="*"/>
        </grid.rowdefinitions>
        <materialdesign:colorzone mode="primarymid" grid.row="0" verticalalignment="stretch">
            <textblock text="联系人" verticalalignment="center" margin="20" fontsize="30"/>
        </materialdesign:colorzone>

        <stackpanel margin="10 30" grid.row="1">
            <grid>
                <materialdesign:packicon kind="face" verticalalignment="bottom" margin="2 12" foreground="{binding borderbrush, elementname=textboxname}"/>
                <textbox x:name="textboxname" margin="5" materialdesign:hintassist.hint="名字" padding="8 0 0 0" text="{binding name}"
                         style="{staticresource materialdesignfloatinghinttextbox}"/>
            </grid>
            <grid>
                <materialdesign:packicon kind="at" verticalalignment="bottom" margin="2 12" foreground="{binding borderbrush, elementname=textboxemail}"/>
                <textbox x:name="textboxemail" margin="5" materialdesign:hintassist.hint="邮件" padding="8 0 0 0" text="{binding email}"
                         style="{staticresource materialdesignfloatinghinttextbox}"/>
            </grid>
            <grid>
                <stackpanel orientation="horizontal" verticalalignment="bottom" margin="2 10">
                    <materialdesign:packicon kind="facebook" foreground="{binding borderbrush, elementname=textboxfacebook}"/>
                    <textblock text="facebook.com/" foreground="{binding borderbrush, elementname=textboxfacebook}"/>
                </stackpanel>
                <textbox x:name="textboxfacebook" margin="5" materialdesign:hintassist.hint="facebook" padding="54 0 0 0" text="{binding facebook}"
                         style="{staticresource materialdesignfloatinghinttextbox}"/>
            </grid>
        </stackpanel>
        <button grid.rowspan="2" margin="50 72" horizontalalignment="right" verticalalignment="top" style="{staticresource materialdesignfloatingactionaccentbutton}"
                click="button_click">
            <materialdesign:packicon kind="contentsave"/>
        </button>

        <materialdesign:snackbar grid.row="1" horizontalalignment="stretch" x:name="snackbarunsavedchanges" verticalalignment="bottom">
            <materialdesign:snackbarmessage
                content="有未保存的更改，是否放弃修改？"
                actioncontent="放弃" actionclick="snackbarmessage_actionclick"/>
        </materialdesign:snackbar>
    </grid>
</window>

3.5 mainwindow.xaml.cs

数据绑定，窗体关闭前表单验证：简单使用hashcode判断绑定实体是否有变化。

using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows;
using system.windows.controls;
using system.windows.data;
using system.windows.documents;
using system.windows.input;
using system.windows.media;
using system.windows.media.imaging;
using system.windows.navigation;
using system.windows.shapes;

namespace validatedatachange
{
    /// <summary>
    /// interaction logic for mainwindow.xaml
    /// </summary>
    public partial class mainwindow : window
    {
        int hash;
        bool discardchanges;

        public mainwindow()
        {
            initializecomponent();

            discardchanges = false;

            var contact = new contact("dotnet9", "[e-mail]", "dotnet9");
            hash = contact.gethashcode();

            this.datacontext = contact;
        }

        private void window_closing(object sender, system.componentmodel.canceleventargs e)
        {
            if (this.datacontext.gethashcode() != hash && !discardchanges)
            {
                snackbarunsavedchanges.isactive = true;
                e.cancel = true;
            }
        }

        private void button_click(object sender, routedeventargs e)
        {
            //保存数据
        }

        private void snackbarmessage_actionclick(object sender, routedeventargs e)
        {
            snackbarunsavedchanges.isactive = false;
            discardchanges = true;
            this.close();
        }
    }
}

3.6 contact.cs

联系人实体类

using system;
using system.collections.generic;
using system.componentmodel;
using system.text;

namespace validatedatachange
{
    internal class contact : inotifypropertychanged
    {
        public event propertychangedeventhandler propertychanged;
        private void notifypropertychanged(string info)
        {
            if (propertychanged != null)
            {
                propertychanged(this, new propertychangedeventargs(info));
            }
        }


        private string name;
        public string name
        {
            get { return name; }
            set { name = value; notifypropertychanged("name"); }
        }
        private string email;
        public string email
        {
            get { return email; }
            set { email = value; notifypropertychanged("email"); }
        }
        private string facebook;
        public string facebook
        {
            get { return facebook; }
            set { facebook = value; notifypropertychanged("facebook"); }
        }

        public contact(string name, string email, string facebook)
        {
            this.name = name;
            this.email = email;
            this.facebook = facebook;
        }

        public override int gethashcode()
        {
            return (name + email + facebook).gethashcode();
        }

    }
}

4.本文参考

design com wpf 大神的学习视频：validate data change

开源控件库：materialdesigninxamltoolkit

本站对md开源控件库的介绍：

5.代码下载

github源码下载：下载

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