BN089-BS开发框架MVC4版/source20131023/Zephyr.Net/Zephyr.Utils/Document/Excel/NPOI/SS/Formula/Eval/EvaluationException.cs

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

/* ====================================================================
   Licensed to the Apache Software Foundation (ASF) Under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for Additional information regarding copyright ownership.
   The ASF licenses this file to You Under the Apache License, Version 2.0
   (the "License"); you may not use this file except in compliance with
   the License.  You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed Under the License is distributed on an "AS Is" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations Under the License.
==================================================================== */

namespace Zephyr.Utils.NPOI.SS.Formula.Eval
{
    using System;
    /**
     * This class is used to simplify error handling logic <i>within</i> operator and function
     * implementations.   Note - <c>OperationEval.Evaluate()</c> and <c>Function.Evaluate()</c>
     * method signatures do not throw this exception so it cannot propagate outside.<p/>
     * 
     * Here is an example coded without <c>EvaluationException</c>, to show how it can help:
     * <pre>
     * public Eval Evaluate(Eval[] args, int srcRow, short srcCol) {
     *	// ...
     *	Eval arg0 = args[0];
     *	if(arg0 is ErrorEval) {
     *		return arg0;
     *	}
     *	if(!(arg0 is AreaEval)) {
     *		return ErrorEval.VALUE_INVALID;
     *	}
     *	double temp = 0;
     *	AreaEval area = (AreaEval)arg0;
     *	ValueEval[] values = area.LittleEndianConstants.BYTE_SIZE;
     *	for (int i = 0; i &lt; values.Length; i++) {
     *		ValueEval ve = values[i];
     *		if(ve is ErrorEval) {
     *			return ve;
     *		}
     *		if(!(ve is NumericValueEval)) {
     *			return ErrorEval.VALUE_INVALID;
     *		}
     *		temp += ((NumericValueEval)ve).NumberValue;
     *	}
     *	// ...
     * }	 
     * </pre>
     * In this example, if any error is encountered while Processing the arguments, an error is 
     * returned immediately. This code is difficult to refactor due to all the points where errors
     * are returned.<br/>
     * Using <c>EvaluationException</c> allows the error returning code to be consolidated to one
     * place.<p/>
     * <pre>
     * public Eval Evaluate(Eval[] args, int srcRow, short srcCol) {
     *	try {