C# For-Loop 不将项目添加到 Observable 集合

Question

所以我在使用 for 循环将值添加到可观察集合中时遇到了问题。我正在尝试向集合中添加 625 个值，但它跳过了一些值，我不知道为什么或者我看不到问题...

如代码中所示，我有两个集合，一个我已经在构造函数中预填充了值（没有问题），另一个我正尝试用新值填充。我有一个循环 625 次的 for 循环（同样有效）但不知何故跳过了一些值，我不知道为什么。

也许还可以说我有一个方法可以在单击 CellCollection 中的某些值时更改，但这发生在 for 循环之前并且实际上与它无关但也许值得一提。

使用 For 循环的方法：

     void neighborCalc()
            {
                //calculates alive neighbors and kills or sets cell alive
                for (int i = 0; i < CellCollection.Count; i++)
                {
                    int neighborAliveCounter = 0;

                    //check top
                    if (CellCollection[i].Row > 1)
                    {
                        CellModel topCell = CellCollection.Single(cell => cell.Column == CellCollection[i].Column && cell.Row == CellCollection[i].Row - 1);
                        if (topCell.IsAlive == true)
                        {
                            neighborAliveCounter = neighborAliveCounter + 1;
                        }
                    }

                    //check bottom
                    if (CellCollection[i].Row < 25)
                    {
                        CellModel bottomCell = CellCollection.Single(cell => cell.Column == CellCollection[i].Column && cell.Row == CellCollection[i].Row + 1);
                        if (bottomCell.IsAlive == true)
                        {
                            neighborAliveCounter = neighborAliveCounter + 1;
                        }
                    }

                    //check left
                    if (CellCollection[i].Column > 1)
                    {
                        CellModel leftCell = CellCollection.Single(cell => cell.Column == CellCollection[i].Column - 1 && cell.Row == CellCollection[i].Row);
                        if (leftCell.IsAlive == true)
                        {
                            neighborAliveCounter = neighborAliveCounter + 1;
                        }
                    }

                    //check right
                    if (CellCollection[i].Column < 25)
                    {
                        CellModel rightCell = CellCollection.Single(cell => cell.Column == CellCollection[i].Column + 1 && cell.Row == CellCollection[i].Row);
                        if (rightCell.IsAlive == true)
                        {
                            neighborAliveCounter = neighborAliveCounter + 1;
                        }
                    }

                    //check topleft
                    if (CellCollection[i].Column > 1 && CellCollection[i].Row > 1)
                    {
                        CellModel topLeftCell = CellCollection.Single(cell => cell.Column == CellCollection[i].Column - 1 && cell.Row == CellCollection[i].Row - 1);
                        if (topLeftCell.IsAlive == true)
                        {
                            neighborAliveCounter = neighborAliveCounter + 1;
                        }
                    }

                    //check top right cell
                    if (CellCollection[i].Row > 1 && CellCollection[i].Column < 25)
                    {
                        CellModel topRightCell = CellCollection.Single(cell => cell.Column == CellCollection[i].Column + 1 && cell.Row == CellCollection[i].Row - 1);
                        if (topRightCell.IsAlive == true)
                        {
                            neighborAliveCounter = neighborAliveCounter + 1;
                        }
                    }

                    //check bottom left cell
                    if (CellCollection[i].Row < 25 && CellCollection[i].Column > 1)
                    {
                        CellModel bottomLeftCell = CellCollection.Single(cell => cell.Column == CellCollection[i].Column - 1 && cell.Row == CellCollection[i].Row + 1);
                        if (bottomLeftCell.IsAlive == true)
                        {
                            neighborAliveCounter = neighborAliveCounter + 1;
                        }
                    }

                    //check bottom right cell
                    if (CellCollection[i].Row < 25 && CellCollection[i].Column < 25)
                    {
                        CellModel bottomRightCell = CellCollection.Single(cell => cell.Column == CellCollection[i].Column + 1 && cell.Row == CellCollection[i].Row + 1);
                        if (bottomRightCell.IsAlive == true)
                        {
                            neighborAliveCounter = neighborAliveCounter + 1;
                        }
                    }

                    //decides if to put cell alive or dead
                    if (neighborAliveCounter < 2 || neighborAliveCounter > 3)
                    {
                        tempCollection.Add(new CellModel() { Row = CellCollection[i].Row, Column = CellCollection[i].Column, CellBackgroundColor = new SolidColorBrush(Colors.Transparent), IsAlive = false });
                    }

                    if (neighborAliveCounter == 3)
                    {                        
tempCollection.Add(new CellModel() { Row = CellCollection[i].Row, Column = CellCollection[i].Column, CellBackgroundColor = new SolidColorBrush(Colors.LightSeaGreen), IsAlive = true });
                    }
                }
            }

我不确定为什么我在它们中没有相同数量的值，并且某些行/列不在缩进位置（这是合乎逻辑的，因为 tempCollection 不知何故没有 625 但更少的值。）

Answer 1

您这里没有处理 neighborAliveCounter == 2 的情况。这就是您得到错误计数的原因。下面的代码块只检查小于 2、等于 3 和大于 3。

//decides if to put cell alive or dead
                    if (neighborAliveCounter < 2 || neighborAliveCounter > 3)
                    {
                        tempCollection.Add(new CellModel() { Row = CellCollection[i].Row, Column = CellCollection[i].Column, CellBackgroundColor = new SolidColorBrush(Colors.Transparent), IsAlive = false });
                    }

                    if (neighborAliveCounter == 3)
                    {                        
tempCollection.Add(new CellModel() { Row = CellCollection[i].Row, Column = CellCollection[i].Column, CellBackgroundColor = new SolidColorBrush(Colors.LightSeaGreen), IsAlive = true });
                    }

C# For-Loop 不将项目添加到 Observable 集合

C# For-Loop not adding Items to Observable Collection

c#

wpf

for-loop

observablecollection