如何将新行添加到绑定到List<；的DataGridView；MyTableClass>；

本文关键字：lt DataGridView gt MyTableClass List 新行 添加 绑定 | 更新日期: 2023-09-27 18:25:54

我有一个WCF服务，它从生成的实体数据模型edmx中查询数据并返回List。然后，我将列表绑定到BindingSource，并将其添加为DataGridView的DataSource。但在应用程序执行时，当我尝试向DataGridView添加新行时，我会得到异常："System.ArgumentException:DataGridViewComboBoxCell值无效"我添加了bindingSource.AllowNew=true，但仍然缺少一些内容。你能告诉我我做错了什么或错过了什么吗？

我所想做的就是使用WCF服务拥有可更新的DataGridView。

编辑：

服务方式：

public List<Cities> GetCities()
{
    try
    {
        CasinoEntities db = new CasinoEntities();
        List<Cities> lsCities = (from e in db.Cities select e).ToList<Cities>();
        return lsCities;
    }
    catch (Exception)
    {
        throw;
    }
    return null;
}

有如何获得列表并绑定它：

private void Form_Load(object sender, EventArgs e)
{
    Service1Client dataServiceClient = new Service1Client();
    List<Cities> citiesList = dataServiceClient.GetCities().ToList();
    this.citiesBindingSource.AllowNew = true;
    this.citiesBindingSource.DataSource = citiesList;
    this.dgvData.DataSource = this.citiesBindingSource;
}

有一个从我的实体模型生成的Cities类：

[Serializable()]
[DataContractAttribute(IsReference=true)]
public partial class Cities : EntityObject
{
    public static Cities CreateCities(global::System.Int32 id, global::System.String name, global::System.Int32 countryId, global::System.Byte[] timestamp)
    {
        Cities cities = new Cities();
        cities.Id = id;
        cities.Name = name;
        cities.CountryId = countryId;
        cities.Timestamp = timestamp;
        return cities;
    }
    [EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
    [DataMemberAttribute()]
    public global::System.Int32 Id
    {
        get
        {
            return _Id;
        }
        set
        {
            if (_Id != value)
            {
                OnIdChanging(value);
                ReportPropertyChanging("Id");
                _Id = StructuralObject.SetValidValue(value);
                ReportPropertyChanged("Id");
                OnIdChanged();
            }
        }
    }
    private global::System.Int32 _Id;
    partial void OnIdChanging(global::System.Int32 value);
    partial void OnIdChanged();
    [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
    [DataMemberAttribute()]
    public global::System.String Name
    {
        get
        {
            return _Name;
        }
        set
        {
            OnNameChanging(value);
            ReportPropertyChanging("Name");
            _Name = StructuralObject.SetValidValue(value, false);
            ReportPropertyChanged("Name");
            OnNameChanged();
        }
    }
    private global::System.String _Name;
    partial void OnNameChanging(global::System.String value);
    partial void OnNameChanged();
    [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
    [DataMemberAttribute()]
    public global::System.Int32 CountryId
    {
        get
        {
            return _CountryId;
        }
        set
        {
            OnCountryIdChanging(value);
            ReportPropertyChanging("CountryId");
            _CountryId = StructuralObject.SetValidValue(value);
            ReportPropertyChanged("CountryId");
            OnCountryIdChanged();
        }
    }
    private global::System.Int32 _CountryId;
    partial void OnCountryIdChanging(global::System.Int32 value);
    partial void OnCountryIdChanged();
    [EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
    [DataMemberAttribute()]
    public global::System.Byte[] Timestamp
    {
        get
        {
            return StructuralObject.GetValidValue(_Timestamp);
        }
        set
        {
            OnTimestampChanging(value);
            ReportPropertyChanging("Timestamp");
            _Timestamp = StructuralObject.SetValidValue(value, true);
            ReportPropertyChanged("Timestamp");
            OnTimestampChanged();
        }
    }
    private global::System.Byte[] _Timestamp;
    partial void OnTimestampChanging(global::System.Byte[] value);
    partial void OnTimestampChanged();
}

如何将新行添加到绑定到List<；的DataGridView；MyTableClass>；

当您尝试添加新记录时，bindingSource将尝试创建Cities，所以我猜你在countryId属性上有一个combobox列，它在创建Cities的新实例时取0，所以假设你用CountryList初始化comboCol，解决方案是：

CountryList.Insert(0,new CountryClass() {CountryId = 0, CountryName = "<Select country>"});
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