自定義INotifyPropertyChanged行為LinqtoSQL

半關于幾年前我的這篇文章：

我需要進行一些更改，以便我的資料網格中的總數在其他欄位更改時更新。這意味著我的解決方法（編輯按鈕）消失了，所以我試圖通過實作 INotifyPropertyChanged（我只是設定視圖主鍵）對部分 linq to sql 類進行一些修改，以獲取我用于計算的視圖。
我將其用作參考：datagrid WPF 中的計算列 如果我可以從此更改自動生成的類中 PaySum_Total getter 的行為，我就可以完成這項作業：

        public decimal PaySum_Total_Pay
        {
            get
            {
                return this._PaySum_Total_Pay;
            }
            set
            {
                if ((this._PaySum_Total_Pay != value))
                {
                    this.OnPaySum_Total_PayChanging(value);
                    this.SendPropertyChanging();
                    this._PaySum_Total_Pay = value;
                    this.SendPropertyChanged("PaySum_Total_Pay");
                    this.OnPaySum_Total_PayChanged();
                }
            }

對此：

        public decimal PaySum_Total_Pay
        {
            get
            {
                return this.CalcTotalOnChange();
            }
            set
            {
                //same code here from earlier
            }
        }

but of course this gets removed as soon as I make any changes to the dbml. I have created another partial class in another file to provide code for some of the stub methods in the class here:

public partial class Payroll_SummaryReview : INotifyPropertyChanging, INotifyPropertyChanged
    {     
        partial void OnPaySum_Total_AdditionsChanged()
        {
            this.OnPaySum_Total_PayChanged();
        }
        partial void OnPaySum_Total_PayChanged()
        {
            this.SendPropertyChanged("PaySum_Total_Pay");
        }
        partial void OnPaySum_IsApprovedChanged()
        {
            //do something as approved cb changes...?
        }
        //partial void OnPaySum_Reason_DescriptionChanged();
        partial void OnPaySum_MinApprovedChanged()
        {
            CalcTotalOnChange();
            this.SendPropertyChanged("PaySum_Total_Pay");
        }
        partial void OnPaySum_TrainerChanged()
        {
            CalcTotalOnChange();
            this.SendPropertyChanged("PaySum_Total_Pay");
        }
        partial void OnPaySum_OOTChanged()
        {
            CalcTotalOnChange();
            this.SendPropertyChanged("PaySum_Total_Pay");
        }
        partial void OnPaySum_MiscAdditionsChanged()
        {
            CalcTotalOnChange();
            this.SendPropertyChanged("PaySum_Total_Pay");
        }
        partial void OnPaySum_PayCorrectionChanged()
        {
            CalcTotalOnChange();
            this.SendPropertyChanged("PaySum_Total_Pay");
        }
        partial void OnPaySum_CallInLoadPayChanged()
        {
            CalcTotalOnChange();
            this.SendPropertyChanged("PaySum_Total_Pay");
        }
        partial void OnPaySum_CallInPayChanged()
        {
            CalcTotalOnChange();
            this.SendPropertyChanged("PaySum_Total_Pay");
        }


        private decimal CalcTotalOnChange()
        {
            decimal total = 0m;

            decimal minimum = this.PaySum_Shifts ?? 0 * this.Min_Rate;
            bool minOk = (this.PaySum_Total_Extra_Pay ?? 0)   this.PaySum_Total_Load_Pay   (this.PaySum_MiscAdditions ?? 0) < minimum
                && this.PaySum_MinApproved
                && (this.PaySum_Total_Additions == null || this.PaySum_Total_Additions == 0);

            if (minOk) //misc addition inclucisive of minimums.
                this.PaySum_Total_Additions = minimum - (this.PaySum_Total_Extra_Pay ?? 0   this.PaySum_Total_Load_Pay   this.PaySum_MiscAdditions ?? 0);
            else
                this.PaySum_Total_Additions = 0M;
            total = this.PaySum_Total_Extra_Pay ?? 0 
                this.PaySum_Total_Load_Pay  
                this.PaySum_Total_Additions ?? 0  
                this.PaySum_OOT ?? 0  
                this.PaySum_Trainer ?? 0  
                this.PaySum_PayCorrection ?? 0  
                this.PaySum_MiscAdditions ?? 0  
                this.PaySum_CallInLoadPay ?? 0;
            int intMo = this.PaySum_Week_End_Date.Month;
            decimal callInRate = 0M;
            if (intMo > 3 && intMo < 10)
                callInRate = 100M;
            else
                callInRate = 85M;
            total  = (Convert.ToDecimal(this.PaySum_CallInPay) * callInRate);

            //section determines eligibility for and amount of Seniority pay.... but I actually added this to the view so screw this section Payroll_SummaryReview.
            //Need to add source to source control
            this.PaySum_Seniority = total * this.SeniorityPercent ?? 0;

            return = total   this._PaySum_Seniority;
            //PayrollDataContext.SavedSummary = false; //need to set unsaved changes flag in Review somewhow
        }

It looks like I can't override the public decimal PaySum_Total_Pay because of the way Linq generates the property. Is there something else I'm not aware of to make this work? I also would be more than happy to approach this from a different angle but I'm not sure what that angle would be right now, but I would appreciate some help here.

Sorry if this is rambling a bit and ugly code, but still a WIP.

uj5u.com熱心網友回復：

您可以在處理事件的部分非自動生成類中實作默認建構式或方法PropertyChanged（我假設自動生成的SendPropertyChanged方法會引發），然后在事件處理程式中更新并引發PropertyChanged事件PaySum_Total_Pay。像這樣的東西：

public partial class Payroll_SummaryReview
{
    public Payroll_SummaryReview()
    {
        this.PropertyChanged  = Payroll_SummaryReview_PropertyChanged;
    }

    private void Payroll_SummaryReview_PropertyChanged(object? sender, PropertyChangedEventArgs e)
    {
        if (e.PropertyName != nameof(PaySum_Total_Pay))
        {
            this._PaySum_Total_Pay = ...;
            PropertyChanged?.Invoke(this,
                new PropertyChangedEventArgs(nameof(PaySum_Total_Pay)));
        }
    }
}

標籤：c# wpf linq datagrid

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