小编biz*_*zah的帖子

我通常覆盖ToString()方法以输出属性名称和与之关联的值.我有点厌倦了手工编写这些,所以我正在寻找一个动态的解决方案.

主要:

TestingClass tc = new TestingClass()
{
    Prop1 = "blah1",
    Prop2 = "blah2"
};
Console.WriteLine(tc.ToString());
Console.ReadLine();

TestingClass:

public class TestingClass
{
    public string Prop1 { get; set; }//properties
    public string Prop2 { get; set; }
    public void Method1(string a) { }//method
    public TestingClass() { }//const
    public override string ToString()
    {
        StringBuilder sb = new StringBuilder();
        foreach (Type type in System.Reflection.Assembly.GetExecutingAssembly().GetTypes())
        {
            foreach (System.Reflection.PropertyInfo property in type.GetProperties())
            {
                sb.Append(property.Name);
                sb.Append(": ");
                sb.Append(this.GetType().GetProperty(property.Name).Name);
                sb.Append(System.Environment.NewLine);
            }
        }
        return sb.ToString();
    }
}

目前输出: …

var doc3 = XDocument.Load(@"C:\Projects\ScanBandConfigTesting\ScanBandConfigTesting\ScanBandConfigSmall.xml");

var scanBand = new ScanBand()
{
    ListOfForms = (from form in doc3.Descendants("form")
                    select new ScanBandForm()
                    {
                        FormTypes = form.Attribute("types").Value,
                        ScanBandNumber = form.Attribute("number").Value,
                        ListOfRows = (from row in form.Descendants("row")
                                        select new ScanBandRow()
                                        {
                                            AllowSpaces = row.Element("allowSpaces").Value.ToLower() == "true",
                                            SplitCharacter = row.Element("splitCharacter").Value,
                                            ListOfColumns = (from column in row.Descendants("column")
                                                            select new ScanBandColumn()
                                                            {
                                                                AlwaysKey = column.Element("allwaysKey").IsEmpty ? false : column.Element("allwaysKey").Value.ToLower() == "true",
                                                                DataTypeString = column.Element("dataType").IsEmpty ? string.Empty : column.Element("dataType").Value,
                                                                MatchingFieldName = column.Element("matchingFieldName").IsEmpty ? string.Empty : column.Element("matchingFieldName").Value,
                                                                NonField = column.Element("nonField").IsEmpty …

public class EcImageWrapper
{

    //etc...

    public IQueryable<EcFieldWrapper> ListOfFields
    {
        get
        {
            //logic here

            return this.listOfFields.AsQueryable();
        }
    }

    public EcFieldWrapper FindBy(Expression<Func<EcFieldWrapper, int, bool>> predicate)
    {
        return this.ListOfFields.Where(predicate).SingleOrDefault();
    }

    public EcFieldWrapper FindByName(string fieldName)
    {
        return this.FindBy(x => x.Name.ToUpper() == fieldName.ToUpper());
        //error here, wanting 3 arguments
        //which makes sense as the above Expression has 3
        //but i don't know how to get around this
    }

由于某种原因,表达式>要求我使用3个参数,在过去我只使用2作为有问题的实例.但是,现在我想在这个实例中对一个集合进行查找.

我收到以下错误:

Delegate 'System.Func<MSDORCaptureUE.Wrappers.EcFieldWrapper,int,bool>' does not take 1 arguments
The best overloaded method match for 'CaptureUE.Wrappers.EcImageWrapper.FindBy(System.Linq.Expressions.Expression<System.Func<CaptureUE.Wrappers.EcFieldWrapper,int,bool>>)' has some …