/// <summary>
/// 创建成员绑定。
/// </summary>
/// <param name="propertyExpression">属性表达式</param>
/// <param name="propertyTarget">目标属性</param>
/// <param name="checkIfNull">是否检查null值</param>
protected void CreateMemberBinding(Expression propertyExpression, MemberInfo propertyTarget, bool checkIfNull)
{
// 访问表达式进行转换
Expression result = visitorMapper.Visit(propertyExpression, checkIfNull);
MemberAssignment bind = Expression.Bind(propertyTarget, result);
memberForNew.Add(bind);
}
public void Visit_ExpressionSubClassCheckIfNull_DefaultValueConstant_ReturnExpression()
{
MapperExpressionVisitor expected = new MapperExpressionVisitor(Expression.Parameter(typeof(ClassSource), "s"));
Expression <Func <ClassSource, object> > exp = x => x.SubClass.PropInt1;
var actual = expected.Visit(exp, true);
Assert.IsTrue(actual.NodeType == ExpressionType.MemberAccess);
}
public void Visit_ExpressionMemberSimple_ReturnExpression()
{
MapperExpressionVisitor expected = new MapperExpressionVisitor(Expression.Parameter(typeof(ClassSource), "s"));
Expression <Func <ClassSource, object> > exp = x => x.PropString1;
var actual = expected.Visit(exp.Body, true);
Assert.IsNotNull(actual);
}
public void Visit_ExpressionLambdaConstantSimple_ReturnExpression()
{
MapperExpressionVisitor expected = new MapperExpressionVisitor(Expression.Parameter(typeof(ClassSource), "s"));
Expression <Func <ClassSource, object> > exp = x => x.PropInt1;
var actual = expected.Visit(exp, true);
Assert.IsNotNull(actual);
}
public void Visit_ExpressionIsNull_ReturnNull()
{
MapperExpressionVisitor expected = new MapperExpressionVisitor(Expression.Parameter(typeof(ClassSource), "s"));
Expression exp = null;
var actual = expected.Visit(exp);
Assert.IsNull(actual);
}
public void Visit_ParameterExpression_CheckIfNull_IsTrue_Expression()
{
MapperExpressionVisitor expected = new MapperExpressionVisitor(Expression.Parameter(typeof(ClassSource), "s"));
ParameterExpression exp = Expression.Parameter(typeof(ClassSource2), "x");
Expression actual = expected.Visit(exp, true) as ParameterExpression;
Assert.IsTrue(actual.NodeType == ExpressionType.Parameter);
Assert.AreNotEqual(actual.Type, exp.Type);
}
/// <summary>
/// 获取排序表达式树
/// </summary>
/// <param name="propertySource">属性名</param>
/// <returns></returns>
public LambdaExpression GetSortedExpression(string propertySource)
{
var exp = PropertiesMapping.Find(x => GetPropertyInfo(x.Item2).Name == propertySource);
if (exp == null)
{
throw new PropertyNoExistException(propertySource, TargetType);
}
// 更改参数
var visitor = new MapperExpressionVisitor(paramClassSource);
var result = visitor.Visit(exp.Item1);
return Expression.Lambda(result, paramClassSource);
}
/// <summary>
/// 创建成员绑定。
/// </summary>
/// <param name="propertyExpression">属性表达式</param>
/// <param name="propertyTarget">目标属性</param>
/// <param name="checkIfNull">是否检查null值</param>
protected void CreateMemberBinding(Expression propertyExpression, MemberInfo propertyTarget, bool checkIfNull)
{
// 访问表达式进行转换
memberForNew.Add(Expression.Bind(propertyTarget, visitorMapper.Visit(propertyExpression, checkIfNull)));
}
