[WPF]GridView或DataGrid中自定义样式:依据某一列设定其对应行的样式(背景色,字体等)

附效果照一张:

本方法使用StyleSelector来 获得依据自定义逻辑的style。

①

 class ConditionalStyleSelector : StyleSelector
     {
         public override Style SelectStyle(object item,DependencyObject container)
         {
             object conditionValue = this.ConditionConverter.Convert(item, null, null, null);
             foreach (ConditionalStyleRule rule in this.Rules)
             {
                 if (Equals(rule.Value, conditionValue))
                 {
                     return rule.Style;
                 }
             }

             return base.SelectStyle(item, container);
         }

         List<ConditionalStyleRule> _Rules;
         public List<ConditionalStyleRule> Rules
         {
             get
             {
                 if (this._Rules == null)
                 {
                     this._Rules = new List<ConditionalStyleRule>();
                 }

                 return this._Rules;
             }
         }

         IValueConverter _ConditionConverter;
         public IValueConverter ConditionConverter
         {
             get
             {
                 return this._ConditionConverter;
             }
             set
             {
                 this._ConditionConverter = value;
             }
         }
     }

     public class ConditionalStyleRule
     {
         object _Value;
         public object Value
         {
             get
             {
                 return this._Value;
             }
             set
             {
                 this._Value = value;
             }
         }

         Style _Style;
         public Style Style
         {
             get
             {
                 return this._Style;
             }
             set
             {
                 this._Style = value;
             }
         }
     }

其中，object conditionValue = this.ConditionConverter.Convert(item, null, null, null);这句话是俺用来进行条件转换的，将输入的条件转换成true或false。（可以转换成各种各样的东西，只要你能在后边拿他来与你定义的样式判断就好）

foreach是俺用来寻找转换后的结果有没有对应样式的

②上面就是主菜，下面说说配菜：

List<ConditionalStyleRule> _Rules;样式的键值对，这个我是在前台xaml里给他赋值的，后边再表。

IValueConverter _ConditionConverter;将输入条件经逻辑判断后返回一个东西来与键值对比较的东西（脱了裤子放屁的设计哈，屎量比较小不怕弄坏裤子的可以放弃他，不用这封装的东西直接与键值对比较）。

public class ConditionalStyleRule{...}这个不用说了吧，封装数据结构的。

③配菜也说完了，嗯，也没大说完，那个IValueConverter还没说：

 class COMStateConverter : IValueConverter
    {
        #region IValueConverter Members
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            COM tempCOM = value as COM;

            if (tempCOM != null)
            {
                return tempCOM.StateCode == "" ? true : false;
            }

            return null;
        }
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
        #endregion

就是一IValueConverter接口，实现了源数据类型以及目标数据类型之间的转换。具体咋回事度娘去吧。

④最后说一下前台xaml的使用

    <UserControl.Resources>
        <Style x:Key="HighUnitPriceStyle"
                   TargetType="GridViewRow">
            <Setter Property="Background" Value="red" />
            <Setter Property="Foreground" Value="blue" />
        </Style>
        <Style x:Key="LowUnitPriceStyle" TargetType="GridViewRow"/>
        <cc:COMStateConverter x:Key="Convert" />
        <cc:ConditionalStyleSelector x:Key="selector" ConditionConverter="{StaticResource Convert}">
            <cc:ConditionalStyleSelector.Rules>
                <cc:ConditionalStyleRule Style="{StaticResource HighUnitPriceStyle}">
                    <cc:ConditionalStyleRule.Value>
                        <sys:Boolean>True</sys:Boolean>
                    </cc:ConditionalStyleRule.Value>
                </cc:ConditionalStyleRule>
                <cc:ConditionalStyleRule Style="{StaticResource LowUnitPriceStyle}">
                    <cc:ConditionalStyleRule.Value>
                        <sys:Boolean>False</sys:Boolean>
                    </cc:ConditionalStyleRule.Value>
                </cc:ConditionalStyleRule>
            </cc:ConditionalStyleSelector.Rules>
        </cc:ConditionalStyleSelector>
    </UserControl.Resources>

然后在DataGrid或GridView中塞进RowStyleSelector="{StaticResource selector}"就好了。上面的代码样式我随便塞了个红蓝进去，具体样式自己整吧。哈