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关于WPF使用MultiConverter控制Button状态的详细介绍

2017年12月12日  | 移动技术网IT编程  | 我要评论

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需求描述
1.按钮的状态需要根据多个数据源的内容作出不同的组合判断
2.每个数据源的判断规则可定制
注：以下功能感觉只是简单粗暴的实现，如果您了解更优雅的解决方案，烦请告诉我下，感谢先！

按钮xaml

复制代码 代码如下:

<button name="btnok"
                 grid.column="2"
                 horizontalalignment="left"
                 verticalalignment="center"
                 command="{binding path=okcommand}"
                 content="{dynamicresource common_button_ok}"
                 isdefault="true"
                 style="{dynamicresource buttonstyle}">
           <button.isenabled>
             <multibinding converter="{staticresource invalidmultivalidationruletobooleanmulticonverter}"
               converterparameter="objectnull|greaterthanzerointeger|greaterthanzerointeger|greaterthanzerointeger">
               <binding elementname="comboboxfilter"
                        mode="oneway"
                        path="selecteditem" />
               <binding elementname="textboxframerate"
                        mode="oneway"
                        path="text" />
               <binding elementname="textboxsizewidth"
                        mode="oneway"
                        path="text" />
               <binding elementname="textboxsizeheight"
                        mode="oneway"
                        path="text" />
             </multibinding>
           </button.isenabled>
         </button>

multiconverter判断
复制代码 代码如下:

public class invalidmultivalidationruletobooleanmulticonverter : imultivalueconverter
  {
    #region imultivalueconverter members

    public object convert(object[] values, type targettype, object parameter, cultureinfo culture)
    {
      string[] paramlist = ((string)parameter).split('|');
      if (paramlist == null || paramlist.length <= 0)
      {
        throw new argumentnullexception("parameter");
      }
      int length = paramlist.length;

      ilist<bool> boollist = new list<bool>();

      for (int i = 0; i < paramlist.length; i++)
      {
        switch (paramlist[i].tolowerinvariant())
        {
          case "checknameexisted":
            boollist.add(validationrulehelper.validate<invalidchecknameexistedvalidationrule>(values[i]));
            break;
          case "directoryandfileexist":
            boollist.add(validationrulehelper.validate<invaliddirectoryandfileexistvalidationrule>(values[i]));
            break;
          case "greaterthanzerointeger":
            boollist.add(validationrulehelper.validate<invalidgreaterthanzerointegervalidationrule>(values[i]));
            break;
          case "numericnull":
            boollist.add(validationrulehelper.validate<invalidnumericnullvalidationrule>(values[i]));
            break;
          case "stringlength":
            boollist.add(validationrulehelper.validate<invalidstringlengthvalidationrule>(values[i]));
            break;
          case "stringnullorempty":
            boollist.add(validationrulehelper.validate<invalidstringnulloremptyvalidationrule>(values[i]));
            break;
          case "ipaddress":
            boollist.add(validationrulehelper.validate<invalidipaddressvalidationrule>(values[i]));
            break;
          case "objectnull":
          default:
            boollist.add(validationrulehelper.validate<invalidobjectnullvalidationrule>(values[i]));
            break;
        }
      }

      bool result = boollist[0];
      for (int i = 1; i < boollist.count; i++)
      {
        result = result & boollist[i];
      }

      return result;
    }

    public object[] convertback(object value, type[] targettypes, object parameter, cultureinfo culture)
    {
      return null;
    }

    #endregion
  }

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